Oligocene-Miocene marine mammals from Belgrade Quarry, North Carolina

IF 1.6 4区地球科学 Q2 PALEONTOLOGY Geobios Pub Date : 2022-10-01 DOI:10.1016/j.geobios.2022.08.002

Robert W. Boessenecker

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引用次数: 1

Abstract

A diverse but fragmentary assemblage of fossil cetaceans is reported from the Oligocene-Miocene Belgrade Formation of North Carolina. This assemblage preserves many odontocetes including four xenorophids (Albertocetus, Echovenator sp., cf. Cotylocara, and Xenorophus sp.), a possible waipatiid (cf. Waipatiidae), a giant agorophiid-grade dolphin (Ankylorhiza), a shark-toothed dolphin (cf. Squalodon), longirostrine “swordfish” dolphins (Eurhinodelphinidae), a longirostrine eoplatanistid dolphin (cf. Eoplatanista), a longirostrine squalodelphinid dolphin, a possible early delphinidan (Kentriodontidae), as well as an eomysticetid baleen whale (Eomysticetus sp.) and sirenian fragments. Most of these taxa are characteristic of or unique to Oligocene deposits (Xenorophidae, cf. Waipatiidae, Ankylorhiza, Eomysticetus) whereas others are more typical of early or middle Miocene deposits (cf. Eoplatanista, Eurhinodelphinidae, cf. Squalodon, Squalodelphinidae, Kentriodontidae). The Belgrade Formation at Belgrade Quarry is dated to 25.95–21.12 Ma, approximating the Oligocene-Miocene transition. The transitional composition of the Belgrade cetacean assemblage suggests gradual changes between Oligocene to Miocene cetacean faunas, to be verified by the discovery of more complete remains from the poorly sampled earliest Miocene (Aquitanian).

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北卡罗莱纳贝尔格莱德采石场渐新世-中新世海洋哺乳动物

北卡罗莱纳渐新世-中新世贝尔格莱德组报道了一组多样化但零碎的鲸类化石。这个组合保存了许多齿动物，包括四种异齿动物(Albertocetus, Echovenator sp.， cf. Cotylocara，和Xenorophus sp.)，一种可能的Waipatiidae (cf. Waipatiidae)，一种巨大的agorophiids级海豚(Ankylorhiza)，一种鲨鱼齿海豚(cf. Squalodon)，长吻海豚“剑鱼”海豚(Eurhinodelphinidae)，一种长吻海豚Eoplatanista，一种长吻海豚squalodelphinids，一种可能的早期海豚(Kentriodontidae)，以及一条Eomysticetus (Eomysticetus sp.)的须鲸和sirenian碎片。这些分类群大多是渐新世沉积物的特征或特有的(xenenorophidae, cf. Waipatiidae, Ankylorhiza, Eomysticetus)，而其他分类群则是中新世早期或中期沉积物的典型(cf. Eoplatanista, Eurhinodelphinidae, cf. Squalodon, Squalodelphinidae, Kentriodontidae)。贝尔格莱德采石场贝尔格莱德组的年代为25.95 ~ 21.12 Ma，接近渐新世-中新世过渡。贝尔格莱德鲸类组合的过渡性组成表明渐新世到中新世鲸类动物群的逐渐变化，这可以通过发现更完整的早中新世(阿基坦尼亚)样本较少的遗骸来验证。

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来源期刊

Geobios 地学-古生物学

CiteScore

3.30

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.