加拿大东部quemassube半岛东南部西点组(志留系)基底海红色化石

IF 1.2 4区 地球科学 Q2 GEOLOGY Atlantic Geology Pub Date : 2016-11-10 DOI:10.4138/ATLGEOL.2016.010
S. Donovan, D. Keighley
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引用次数: 1

摘要

加拿大大西洋和魁北克省南部的志留纪地层在当地保存了常见的海百合化石,尽管大部分是未连接的遗骸。西点地层(Ludlow至Pridoli?) Chaleurs群的新海百合;加斯佩半岛的上志留统(上志留统)包括伊奥里诺?maennili (Yeltysheva)(也称为爱沙尼亚的Katian), Bystrowicrinus (col.) depressus sp. 11 .和Cyclocyclicus (col.) sp. a ς。C.(上校)echinus Donovan。根据其大体形态和地层位置,maennili不太可能是一个在奥陶纪末期灭绝的异世科。迄今为止,这个不起眼的名字一直被错误地拼写为mannili、mannili和mjannili。常见的Bystrowicrinus (coll) depressus的大多数标本呈环状,因为五星状管腔位于深凹的通常被沉积物阻塞的闭孔中;干净的标本很有特色。cylocyclicus的词源:C. (col.) echinus与北威尔士Katian已知的一种相似。综上所述,该组合更令人联想到卡田地层(上奥陶统)。鉴于目前将露头绘制为西点组(上志留纪),Ḁis存在问题,这表明需要对该地区进行进一步的地层学研究。
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Fossil crinoids from the basal West Point Formation (Silurian), southeast Gaspé Peninsula, Québec, eastern Canada
Silurian strata of Atlantic Canada and southern Quebec locally preserve common fossil crinoids, albeit mostly as disarticulated remains. New crinoids from the Chaleurs Group, West Point Formation (Ludlow to Pridoli?; Upper Silurian) of the Gaspe Peninsula include Iocrinus ? maennili (Yeltysheva) (otherwise known from the Katian of Estonia), Bystrowicrinus (col.) depressus sp. nov. and Cyclocyclicus (col.) sp. aἀ. C. (col.) echinus Donovan. On the basis of both its gross morphology and stratigraphic position, Iocrinus ? maennili is unlikely to be an iocrinid disparid, a family that became extinct at the end of the Ordovician. The trivial name has hitherto been erroneously spelled as mannili , mannili and mjannili . Most specimens of the common Bystrowicrinus (col.) depressus appear cyclocyclic because the pentastellate lumen occurs in a deeply sunken claustrum that is commonly occluded by sediment; clean specimens are highly distinctive. Cyclocyclicus (col.) sp. aἀ. C. (col.) echinus is similar to a species known from the Katian of North Wales. Taken together, this assemblage is more reminiscent of Katian strata (Upper Ordovician). Ḁis is problematic given the current mapping of the outcrop as West Point Formation (Upper Silurian), suggesting further stratigraphic studies in the area are required.
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来源期刊
Atlantic Geology
Atlantic Geology GEOLOGY-
CiteScore
2.10
自引率
18.80%
发文量
0
审稿时长
>12 weeks
期刊介绍: Atlantic Geology (originally Maritime Sediments, subsequently Maritime Sediments and Atlantic Geology) covers all aspects of the geology of the North Atlantic region. It publishes papers, notes, and discussions on original research and review papers, where appropriate to the regional geology.
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