Early Jurassic (middle Hettangian) marine gastropods from the Pogibshi Formation (Alaska) and their paleobiogeographical significance

IF 0.9 4区 地球科学 Q3 GEOLOGY
S. Ferrari, R. Blodgett, M. Hodges, C. Hodges
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引用次数: 1

Abstract

A middle Hettangian marine gastropod assemblage is reported from the Kenai Peninsula of south-central Alaska supplying new paleontological evidence of this group in Lower Jurassic rocks of North America. Pleurotomaria pogibshiensis sp. nov. is described from the middle Hettangian marine succession informally known as Pogibshi formation, being the first occurrence of the genus in the Kenai Peninsula and the oldest occurrence of the genus in present-day Alaska and North America. One species of the genus Lithotrochus, namely Lithotrochus humboldtii (von Buch), is also reported for the first time from the Kenai Peninsula. Lithotrochus has been considered as endemic to South America for a time range from the early Sinemurian to the late Pliensbachian. The newest occurrence of Lithotrochus in rocks of the Pogibshi formation extends the paleobiogeographical and chronostratigraphical distribution of the genus into the present-day Northern Hemisphere. However, the Southern Hemisphere affinities are consistent with the hypothetical interpretations (although supported both by paleobiogeographical and paleomagnetic data) that the Peninsular terrane of south-central Alaska is far-traveled and may have originated at much more southerly paleolatitudes than its present-day position. Two other Early Jurassic caenogastropods typical of the Andean region of South America and of the Tethyan epicontinental seas are described for the first time in the Pogibshi formation, and these are Pseudomelania sp. and Pictavia sp. The new gastropod assemblage reported here shows close affinities with coeval South American and European gastropod faunas, supplying new evidence to interpret their distribution during the Early Jurassic.
阿拉斯加Pogibshi组早侏罗世(中河唐期)海相腹足类及其古地理意义
在阿拉斯加中南部的基奈半岛发现了一种中河唐期海相腹足类动物组合,为北美下侏罗统岩石中该群的存在提供了新的古生物证据。Pleurotomaria pogibshiensis sp. 11 .被描述为来自Hettangian中期的海洋演替,非正式地称为Pogibshi组,是该属在基奈半岛的第一个出现,也是该属在今天的阿拉斯加和北美最古老的出现。在基奈半岛也首次报道了一种Lithotrochus属,即Lithotrochus humboldtii (von Buch)。岩石龙被认为是南美的特有种,时间范围从早期的Sinemurian到晚期的Pliensbachian。在Pogibshi组岩石中最新发现的Lithotrochus将该属的古生物地理和年代地层分布扩展到今天的北半球。然而,南半球的相似性与假设的解释是一致的(尽管得到了古生物地理学和古地磁数据的支持),即阿拉斯加中南部的半岛地体是远行的,可能起源于比现在更靠南的古纬度。在Pogibshi组中首次发现了南美洲安第斯地区和特提斯陆表海的另外两种早侏罗世典型的腹足类动物,它们是Pseudomelania sp.和Pictavia sp.。本文报道的新腹足类动物组合与同期南美和欧洲的腹足类动物有密切的亲缘关系,为解释它们在早侏罗世的分布提供了新的证据。
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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