{"title":"THE SCLEROTIC RING OF THE LATE TRIASSIC THEROPOD DINOSAUR COELOPHYSIS","authors":"L. Rinehart, A. Heckert, S. Lucas, A. Hunt","doi":"10.56577/sm-2004.722","DOIUrl":"https://doi.org/10.56577/sm-2004.722","url":null,"abstract":"","PeriodicalId":142738,"journal":{"name":"New Mexico Geological Society, 2004 Annual Spring Meeting, Proceedings Volume","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122077274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"PLIOCENE TO PLEISTOCENE LANDSCAPE EVOLUTION OF THE SOUTHWESTERN JEMEZ MOUNTAINS, NEW MEXICO","authors":"Steven Scholle, S. Kelley","doi":"10.56577/sm-2004.725","DOIUrl":"https://doi.org/10.56577/sm-2004.725","url":null,"abstract":"","PeriodicalId":142738,"journal":{"name":"New Mexico Geological Society, 2004 Annual Spring Meeting, Proceedings Volume","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116635679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A NEW FLORA FROM THE CREVASSE CANYON FORMATION IN CENTRAL NEW MEXICO","authors":"K. Jacobs","doi":"10.56577/sm-2004.691","DOIUrl":"https://doi.org/10.56577/sm-2004.691","url":null,"abstract":"","PeriodicalId":142738,"journal":{"name":"New Mexico Geological Society, 2004 Annual Spring Meeting, Proceedings Volume","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122836373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tonganoxichnus robledoensis and Robledoichnus lucasi are ichnotaxa that have previously been reported only from single occurrences in Lower Permian strata of southern New Mexico. Here we record the first occurrence of these ichnotaxa outside of their type localities within the Robledo Mountains Formation, thus augmenting their distribution. Single specimens of each ichnotaxon occur in association on a slab that was collected from New Mexico Museum of Natural History (NMMNH) locality 5383 in the lower part of the Abo Formation in the Red Gap area of the Fra Cristobal Mountains in Sierra County, New Mexico. The specimens are from a 0.7-meter thick unit of thinly bedded, ripplelaminated sandstone. A low diversity tetrapod ichnofauna that is dominated by Batrachichnus occurs at this site. Several specimens of the invertebrate burrow Taenidium have also been found. The paleoenvironment was a fluvial sandflat on a coastal floodplain. symmetrical trace anterior, posterior, and terminal that ichnospecies. Lateral the Robledo Mountains Formation type the mid-line. two types within T. , variations in jumping behavior. three pairs of lateral imprints that anteriorly directed. Fra three pairs of lateral imprints in anterior imprints anteriorly directed, the medial imprints laterally directed, the posterior imprints are posteriorly directed. orientation similarly in T. , resting trace the Upper Carboniferous Two track rows of walking imprints are shown that contain a twoimprint arrangement comparable to the type specimen from the Shalem Colony section of the Robledo Mountains Formation. A separate landing trace is not preserved. The trackway is 7 cm long and 1 cm in external width. It is separated from P-40869 by a distance of 7 cm. The external width of the trackway coincides with the distal width of the leg appendage imprints seen on the associated T. robledoensis . Kozur and Lemone thought that the producer of R. lucasi flying insect. We propose R. lucasi produced by an apterygote monuran, the same Tonganoxichnus
{"title":"NEW RECORDS OF THE INVERTEBRATE ICHNOFOSSILS ROBLEDOICHNUS AND TONGANOXICHNUS FROM THE LOWER PERMIAN OF NEW MEXICO","authors":"A. J. Lerner, S. Lucas, A. Hunt","doi":"10.56577/sm-2004.700","DOIUrl":"https://doi.org/10.56577/sm-2004.700","url":null,"abstract":"Tonganoxichnus robledoensis and Robledoichnus lucasi are ichnotaxa that have previously been reported only from single occurrences in Lower Permian strata of southern New Mexico. Here we record the first occurrence of these ichnotaxa outside of their type localities within the Robledo Mountains Formation, thus augmenting their distribution. Single specimens of each ichnotaxon occur in association on a slab that was collected from New Mexico Museum of Natural History (NMMNH) locality 5383 in the lower part of the Abo Formation in the Red Gap area of the Fra Cristobal Mountains in Sierra County, New Mexico. The specimens are from a 0.7-meter thick unit of thinly bedded, ripplelaminated sandstone. A low diversity tetrapod ichnofauna that is dominated by Batrachichnus occurs at this site. Several specimens of the invertebrate burrow Taenidium have also been found. The paleoenvironment was a fluvial sandflat on a coastal floodplain. symmetrical trace anterior, posterior, and terminal that ichnospecies. Lateral the Robledo Mountains Formation type the mid-line. two types within T. , variations in jumping behavior. three pairs of lateral imprints that anteriorly directed. Fra three pairs of lateral imprints in anterior imprints anteriorly directed, the medial imprints laterally directed, the posterior imprints are posteriorly directed. orientation similarly in T. , resting trace the Upper Carboniferous Two track rows of walking imprints are shown that contain a twoimprint arrangement comparable to the type specimen from the Shalem Colony section of the Robledo Mountains Formation. A separate landing trace is not preserved. The trackway is 7 cm long and 1 cm in external width. It is separated from P-40869 by a distance of 7 cm. The external width of the trackway coincides with the distal width of the leg appendage imprints seen on the associated T. robledoensis . Kozur and Lemone thought that the producer of R. lucasi flying insect. We propose R. lucasi produced by an apterygote monuran, the same Tonganoxichnus","PeriodicalId":142738,"journal":{"name":"New Mexico Geological Society, 2004 Annual Spring Meeting, Proceedings Volume","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125985711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"PERMIAN STRATIGRAPHY AND CYCLES OF DEPOSITION IN THE LUCERO UPLIFT, CENTRAL NEW MEXICO","authors":"K. Zeigler","doi":"10.56577/sm-2004.728","DOIUrl":"https://doi.org/10.56577/sm-2004.728","url":null,"abstract":"","PeriodicalId":142738,"journal":{"name":"New Mexico Geological Society, 2004 Annual Spring Meeting, Proceedings Volume","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124648095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Holder Formation along Dry Canyon consists mainly of a 75 m-thick cyclic sequence of Virgilian marine siliciclastics, marine carbonates, and alluvial siliciclastics above a large basal algal bioherm complex (Yucca mound), deposited on a narrow shelf just west of the shoreline of the Pedernal land mass. Holder marine invertebrates have been little studied; here two quite different marine assemblages from road cuts in the upper part of the Holder, around Milepost 5 of US-82, are summarized. The first assemblage is from a 1-m-thick interval of dark gray calcareous mudstone within a regressive sequence about 45 m above the top of the bioherm. This assemblage is dominated by gastropods (18 species, of which Retispira espinasa , 42%, Taosia crenulata , 17%, Colpites monilifera , 13%, Hypselentoma perhumerosa , 9%, and Goniasma lasallensis , 7%, are most abundant), and bivalves (9 species; Polidevcia arata , 56%, cf. Sedgwickia topekaensis , 25%, and Myalinella sp., 11%, most abundant), with rare brachiopods ( Linoproductus ) and nautiloid cephalopods ( Metacoceras, Pseudorthoceras ). Three of the five most common gastropods are also present in the overlying Laborcita Formation, but H. perhumerosa and the bivalve cf. Sedgwickia topekaensis have not previously been reported from New Mexico. The absence of most stenohaline marine groups (crinoids, bryozoans, corals, fusulinids) and low taxonomic diversity of this assemblage suggest abnormal marine conditions. The second assemblage, from 15-20 m above the first, at the top of the road cut, is from interbedded dark gray shale and thin-bedded limestone. It includes gastropods (42 species), bivalves (19 species), brachiopods (22 species), as well as cephalopods, scaphopods, solitary rugose corals, bryozoans, crinoids, echinoids, trilobites, ostracods, fish teeth, and fusulinids. The most common gastropods are Euphemites sp. (18%), Donaldina stevensana (14%), Amphiscapha subrugosa (9%), Glabrocingulum (Ananias) spp. (8%), Retispira tenuilineata (6%), Strobeus spp. (6%), and Hypergonia n. sp. (5%). Bivalves are dominated by fragments of Myalina (Orthomyalina) subquadrata (41%), followed by Nuculopsis spp. (19%), Edmondia (10%), and Permophorus (8%). The most abundant brachiopods are Crurithyris planoconvexa (54%), Neochonetes granulifer (16%), Kutorginella aff. lasallensis (12%), Composita subtilita (5%), and Neospirifer cf. dunbari (4%). The productoid Kutorginella has not previously been reported from New Mexico. High taxonomic diversity, abundant stenohaline groups, large numbers of molluscs, and dominantly dark gray shale substrate indicates that the fauna of the second assemblage lived in a nearshore, quiet, normal marine environment characterized by moderate influx of fine-grained siliciclastics. Many of the species in these Holder assemblages are known from Virgilian strata elsewhere in New Mexico, but the taxonomic composition and relative abundances of taxa in the two assemblages are distinctive.
{"title":"LATE PENNSYLVANIAN (VIRGILIAN) MARINE INVERTEBRATE ASSEMBLAGES IN THE HOLDER FORMATION, DRY CANYON, SACRAMENTO MOUNTAINS, NEW MEXICO","authors":"B. Kues","doi":"10.56577/sm-2004.697","DOIUrl":"https://doi.org/10.56577/sm-2004.697","url":null,"abstract":"The Holder Formation along Dry Canyon consists mainly of a 75 m-thick cyclic sequence of Virgilian marine siliciclastics, marine carbonates, and alluvial siliciclastics above a large basal algal bioherm complex (Yucca mound), deposited on a narrow shelf just west of the shoreline of the Pedernal land mass. Holder marine invertebrates have been little studied; here two quite different marine assemblages from road cuts in the upper part of the Holder, around Milepost 5 of US-82, are summarized. The first assemblage is from a 1-m-thick interval of dark gray calcareous mudstone within a regressive sequence about 45 m above the top of the bioherm. This assemblage is dominated by gastropods (18 species, of which Retispira espinasa , 42%, Taosia crenulata , 17%, Colpites monilifera , 13%, Hypselentoma perhumerosa , 9%, and Goniasma lasallensis , 7%, are most abundant), and bivalves (9 species; Polidevcia arata , 56%, cf. Sedgwickia topekaensis , 25%, and Myalinella sp., 11%, most abundant), with rare brachiopods ( Linoproductus ) and nautiloid cephalopods ( Metacoceras, Pseudorthoceras ). Three of the five most common gastropods are also present in the overlying Laborcita Formation, but H. perhumerosa and the bivalve cf. Sedgwickia topekaensis have not previously been reported from New Mexico. The absence of most stenohaline marine groups (crinoids, bryozoans, corals, fusulinids) and low taxonomic diversity of this assemblage suggest abnormal marine conditions. The second assemblage, from 15-20 m above the first, at the top of the road cut, is from interbedded dark gray shale and thin-bedded limestone. It includes gastropods (42 species), bivalves (19 species), brachiopods (22 species), as well as cephalopods, scaphopods, solitary rugose corals, bryozoans, crinoids, echinoids, trilobites, ostracods, fish teeth, and fusulinids. The most common gastropods are Euphemites sp. (18%), Donaldina stevensana (14%), Amphiscapha subrugosa (9%), Glabrocingulum (Ananias) spp. (8%), Retispira tenuilineata (6%), Strobeus spp. (6%), and Hypergonia n. sp. (5%). Bivalves are dominated by fragments of Myalina (Orthomyalina) subquadrata (41%), followed by Nuculopsis spp. (19%), Edmondia (10%), and Permophorus (8%). The most abundant brachiopods are Crurithyris planoconvexa (54%), Neochonetes granulifer (16%), Kutorginella aff. lasallensis (12%), Composita subtilita (5%), and Neospirifer cf. dunbari (4%). The productoid Kutorginella has not previously been reported from New Mexico. High taxonomic diversity, abundant stenohaline groups, large numbers of molluscs, and dominantly dark gray shale substrate indicates that the fauna of the second assemblage lived in a nearshore, quiet, normal marine environment characterized by moderate influx of fine-grained siliciclastics. Many of the species in these Holder assemblages are known from Virgilian strata elsewhere in New Mexico, but the taxonomic composition and relative abundances of taxa in the two assemblages are distinctive.","PeriodicalId":142738,"journal":{"name":"New Mexico Geological Society, 2004 Annual Spring Meeting, Proceedings Volume","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126466037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Rio Grande, an important water source in New Mexico, flows through the Socorro Basin, located in central New Mexico. An interesting feature in the Socorro Basin is the Socorro accommodation zone (SAZ), a 2-km-wide, topographically high zone that separates tilted half grabens of opposite dip directions. There is evidence that the SAZ has had a large influence on volcanism in the area and is a zone of groundwater movement. This study focuses on the presence, and possible origin of high chloride waters observed in certain areas in the shallow groundwater system in the Socorro Basin. These waters seep into irrigation drains and canals and eventually make their way into the Rio Grande, impacting the water quality of the river. Water chemistry suggests that these high chloride waters are sedimentary brines with a deep origin. Other water types in the shallow groundwater system include river water, the dominant water type, and water that is chemically similar to Socorro Springs, a warm spring on the western edge of the basin. Water that discharges at Socorro Springs is believed to come from La Jencia Basin an adjacent closed basin to the west. Existing gravity data for the basin combined with the spatial distribution of high chloride water and Socorro Spring type water imply that upwelling of deep basin brines and regional groundwater flow paths may be structurally controlled and directly related to cross-basinal structures associated with the SAZ. The known relationship between the SAZ and past volcanic events suggests that geothermal waters may also play a part in upwelling of the high chloride waters.
{"title":"INVESTIGATION ON THE PRESENCE AND ORIGIN OF HIGH CHLORIDE WATERS IN THE SHALLOW HYDROLOGIC SYSTEM IN THE SOCORRO BASIN, NEW MEXICO","authors":"B. Newton, R. Bowman, F. Phillips, P. Johnson","doi":"10.56577/sm-2004.715","DOIUrl":"https://doi.org/10.56577/sm-2004.715","url":null,"abstract":"The Rio Grande, an important water source in New Mexico, flows through the Socorro Basin, located in central New Mexico. An interesting feature in the Socorro Basin is the Socorro accommodation zone (SAZ), a 2-km-wide, topographically high zone that separates tilted half grabens of opposite dip directions. There is evidence that the SAZ has had a large influence on volcanism in the area and is a zone of groundwater movement. This study focuses on the presence, and possible origin of high chloride waters observed in certain areas in the shallow groundwater system in the Socorro Basin. These waters seep into irrigation drains and canals and eventually make their way into the Rio Grande, impacting the water quality of the river. Water chemistry suggests that these high chloride waters are sedimentary brines with a deep origin. Other water types in the shallow groundwater system include river water, the dominant water type, and water that is chemically similar to Socorro Springs, a warm spring on the western edge of the basin. Water that discharges at Socorro Springs is believed to come from La Jencia Basin an adjacent closed basin to the west. Existing gravity data for the basin combined with the spatial distribution of high chloride water and Socorro Spring type water imply that upwelling of deep basin brines and regional groundwater flow paths may be structurally controlled and directly related to cross-basinal structures associated with the SAZ. The known relationship between the SAZ and past volcanic events suggests that geothermal waters may also play a part in upwelling of the high chloride waters.","PeriodicalId":142738,"journal":{"name":"New Mexico Geological Society, 2004 Annual Spring Meeting, Proceedings Volume","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116861280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Heckert, S. Lucas, L. Rinehart, J. Spielmann, A. Hunt, R. Kahle
{"title":"DISTRIBUTION OF THE ENIGMATIC REPTILE TRILOPHOSAURUS, AN UNUSUAL ARCHOSAUROMORPH FROM THE UPPER TRIASSIC CHINLE GROUP, SOUTHWESTERN USA","authors":"A. Heckert, S. Lucas, L. Rinehart, J. Spielmann, A. Hunt, R. Kahle","doi":"10.56577/sm-2004.684","DOIUrl":"https://doi.org/10.56577/sm-2004.684","url":null,"abstract":"","PeriodicalId":142738,"journal":{"name":"New Mexico Geological Society, 2004 Annual Spring Meeting, Proceedings Volume","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131534788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Picuris–Pecos fault of northern New Mexico is the largest known fault in the Rocky Mountain region with 37 km of dextral strike separation of Proterozoic lithotypes. The timing of dextral slip is disputed. The Picuris-Pecos fault system continues southward from Lamy, New Mexico, as a complex zone of faults that cuts strata of Mesozoic age and is intruded by the unfaulted, 27 Ma Galisteo dike. On the San Cristobal Ranch, ~20 km south of Lamy, a ~2 km dextral step in the fault system is characterized by numerous, steep NNE-striking faults that exhibit normal separation and form an en echelon array (A. Lisenbee, 2000, NMBMMR OF-GM-39). Many of the fault blocks in this en echelon array include outcrops of the Dakota Sandstone (Upper Cretaceous, ~95 Ma), thus affording a unique opportunity to stratigraphically evaluate Laramide strike-slip across much of the Picuris–Pecos fault system. On the San Cristobal Ranch, eight detailed measured stratigraphic sections (separated from each other by 0.1 to 2.0 km) of the Oak Canyon and Cubero Members of the Dakota Sandstone display significant stratigraphic differences between adjacent fault blocks. Comparison to six control sections (separated from each other by 0.6 to 3.5 km) measured in unfaulted areas west of the Picuris–Pecos fault system (two sections near Lamy; four near Galisteo Dam) indicates the across-fault stratigraphic differences observed on the San Cristobal Ranch are too great to be attributed simply to lateral facies variation, but instead require strike-slip juxtaposition of dissimilar
{"title":"COMPARATIVE STRATIGRAPHY OF THE DAKOTA SANDSTONE ACROSS THE PICURIS–PECOS FAULT SYSTEM SOUTH OF LAMY, NEW MEXICO: DEFINITIVE EVIDENCE OF LARAMIDE STRIKE-SLIP","authors":"S. Cather, S. Lucas","doi":"10.56577/sm-2004.671","DOIUrl":"https://doi.org/10.56577/sm-2004.671","url":null,"abstract":"The Picuris–Pecos fault of northern New Mexico is the largest known fault in the Rocky Mountain region with 37 km of dextral strike separation of Proterozoic lithotypes. The timing of dextral slip is disputed. The Picuris-Pecos fault system continues southward from Lamy, New Mexico, as a complex zone of faults that cuts strata of Mesozoic age and is intruded by the unfaulted, 27 Ma Galisteo dike. On the San Cristobal Ranch, ~20 km south of Lamy, a ~2 km dextral step in the fault system is characterized by numerous, steep NNE-striking faults that exhibit normal separation and form an en echelon array (A. Lisenbee, 2000, NMBMMR OF-GM-39). Many of the fault blocks in this en echelon array include outcrops of the Dakota Sandstone (Upper Cretaceous, ~95 Ma), thus affording a unique opportunity to stratigraphically evaluate Laramide strike-slip across much of the Picuris–Pecos fault system. On the San Cristobal Ranch, eight detailed measured stratigraphic sections (separated from each other by 0.1 to 2.0 km) of the Oak Canyon and Cubero Members of the Dakota Sandstone display significant stratigraphic differences between adjacent fault blocks. Comparison to six control sections (separated from each other by 0.6 to 3.5 km) measured in unfaulted areas west of the Picuris–Pecos fault system (two sections near Lamy; four near Galisteo Dam) indicates the across-fault stratigraphic differences observed on the San Cristobal Ranch are too great to be attributed simply to lateral facies variation, but instead require strike-slip juxtaposition of dissimilar","PeriodicalId":142738,"journal":{"name":"New Mexico Geological Society, 2004 Annual Spring Meeting, Proceedings Volume","volume":"59 Pt A 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115352877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Three Teeth from the Naashoibito Member, Kirtland Formation can be referred to the unusual teiid lizard Peneteius . Specimens NMMNH P-36544, P-41223, and P-41224 were recovered by screen washing from NMMNH locality 4005. The locality 4005 has also yielded isolated teeth mammals including the Lancian index taxon Essonodon browni , dinosaurs, crocodilians, and other squamates. P-41223 represents an isolated lower tooth, P-36544 and P-41224 are upper teeth. Isolated osteoderms (P-36543) from locality 4005 may also belong to the same taxon. The Naashoibito Member Peneteius teeth closely resemble the teeth of P. aquilonius , from the late Maastrichtian Hell Creek Formation of Montana. Peneteius is also known from the late Maastrichtian of Montana and the Campanian of Utah and Texas. Peneteius has teeth with a more complicated structure than is known for any other lizard. They are convergent on the molariform cheek teeth of mammals. It was a relatively small lizard with an estimated snout to vent length of about 80 mm and may have had an insectivorous diet. Its mammal-like teeth may have allowed it to orally process food more efficiently than other lizards.
{"title":"FIRST OCCURRENCE OF THE TEIID LIZARD PENETEIUS FROM THE LATEST CRETACEOUS NAASHOIBITO MEMBER, KIRTLAND FORMATION, SAN JUAN BASIN, NEW MEXICO","authors":"T. Williamson, A. Weil","doi":"10.56577/sm-2004.727","DOIUrl":"https://doi.org/10.56577/sm-2004.727","url":null,"abstract":"Three Teeth from the Naashoibito Member, Kirtland Formation can be referred to the unusual teiid lizard Peneteius . Specimens NMMNH P-36544, P-41223, and P-41224 were recovered by screen washing from NMMNH locality 4005. The locality 4005 has also yielded isolated teeth mammals including the Lancian index taxon Essonodon browni , dinosaurs, crocodilians, and other squamates. P-41223 represents an isolated lower tooth, P-36544 and P-41224 are upper teeth. Isolated osteoderms (P-36543) from locality 4005 may also belong to the same taxon. The Naashoibito Member Peneteius teeth closely resemble the teeth of P. aquilonius , from the late Maastrichtian Hell Creek Formation of Montana. Peneteius is also known from the late Maastrichtian of Montana and the Campanian of Utah and Texas. Peneteius has teeth with a more complicated structure than is known for any other lizard. They are convergent on the molariform cheek teeth of mammals. It was a relatively small lizard with an estimated snout to vent length of about 80 mm and may have had an insectivorous diet. Its mammal-like teeth may have allowed it to orally process food more efficiently than other lizards.","PeriodicalId":142738,"journal":{"name":"New Mexico Geological Society, 2004 Annual Spring Meeting, Proceedings Volume","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114510357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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