皖北寒武系张夏组上部的三叶虫新材料

doi:10.19657/j.geoscience.1000-8527.2021.146

摘要/Abstract

摘要：

本研究是对皖北寒武系苗岭统古丈阶张夏组上部三叶虫的首次全面详细描述。在安徽省萧县凤凰山剖面张夏组上部地层中共采得古丈期三叶虫15属12种及4个未定种。包括球接子类4属3种及1未定种、褶颊虫目2属2种、裂肋虫目9属7种及3未定种。化石大多以分离的头盖、尾部、活动颊保存在鲕粒灰岩中,保存质量良好。从生物面貌来看,本研究区张夏组上部相当于山东地区的崮山组地层,并共同包含多个三叶虫属种。但相较后者,本区的优势分子为Pseudoblackwelderia lubrica和Wongia triangulata。另外,本文对假蝴蝶虫属Pseudoblackwelderia进行了梳理与重新厘定。

关键词: 三叶虫, 张夏组, 古丈阶, 寒武系, 皖北地区

Abstract:

This study is the first comprehensive description of the trilobites from the upper part of the Changhia Formation (Cambrian, Miaolingian, Guzhangian) at Fenghuangshan in Xiaoxian (Anhui Province). The samples include 15 genera, 12 species, and 4 indet. species, of which 4 genera, 3 species and 1 indet. species belong to Agnostida, 2 genera and 2 species belong to Ptychopariida, 9 genera, and 7 species and 3 indet. species belong to Lichida. The separated cranidia, pygidia and librigena are well preserved in the limestone. The upper Changhia Formation in northern Anhui is equivalent to the Kushan Formation of Shandong Province, with several same trilobite species. Comparing with Shandong and other regions, the dominant trilobites of the Changhia Formation of the studied area are Pseudoblackwelderia lubrica and Wongia triangulata. The review of the genus Pseudoblackwelderia is also revised.

Key words: trilobite, Changhia Formation, Guzhangian, Cambrian, northern Anhui

中图分类号:

Q915.819.1

雷倩萍. 皖北寒武系张夏组上部的三叶虫新材料[J]. 现代地质, 2023, 37(02): 500-511.

LEI Qianping. Trilobites from the Cambrian Upper Changhia Formation in Northern Anhui[J]. Geoscience, 2023, 37(02): 500-511.

图/表 4

图1 化石产地地理位置图

Fig.1 Geographic map showing the location of fossil site

图2 剖面岩性柱状图(箭头指示化石采集层位)

Fig.2 Lithological column of the fossil section (arrows showing the fossil collection site)

图3 皖北寒武系张夏组上部三叶虫全部标本采自安徽萧县凤凰山剖面(WXN),比例尺为1 mm。1—3.Pseudagnostus koerferi(Monke,1903);1.CZM000055-7,头盖;2.CZM000056,尾部;3.CZM000057,尾部。4—5.Homagnostus convexus Chu,1959;4.CZM000058,头盖;5.CZM000059,尾部.6—9.Hadragnostus medestus(Lochman in Lochman and Duncan,1944);6.CZM000060-7,头盖;7.CZM000061,头盖;8.CZM000062,尾部;9.CZM000063,尾部。10.Ammagnostus sp.,CZM000064-6,尾部。11—15. Wongia triangulate Sun,1924;11.CZM000065,头盖;12.CZM000066-4,头盖;13.CZM000067,头盖;14.CZM000055-1,尾部;15.CZM000068,尾部。16—20.Liostracina krausei Monke,1903;16.CZM000064-4,头盖;17.CZM000069,头盖;18.CZM000070,头盖;19.CZM000071,尾部;20.CZM000072,尾部。21—23.Damesella sp.;21.CZM000055-3,头盖;22.CZM000055-2,头盖;23.CZM000073,头盖。24—25.Stephanocare richthofeni Monke,1903;24.CZM000074,尾部;25.CZM000060-15,尾部。26—30.Teinistion lansi Monke,1903.26.CZM000075,头盖;27.CZM000064-1,头盖;28.CZM000076,头盖;29.CZM000066-3,尾部;30.CZM000077,尾部;31—32.Bergeronites sp.;31.CZM000109,尾部;32.CZM000110,尾部。31—32.Shantungia sp.;33.CZM000096,尾部;34.CZM000097,尾部;35.Chiawangella pustulosa Chu,1959,CZM000108-5,尾部

Fig.3 Trilobites from the Cambrian Upper Changhia Formation in northern Anhui

图4 皖北寒武系张夏组上部三叶虫全部标本采自安徽萧县凤凰山剖面(WXN),比例尺为1 mm。1—15.Pseudoblackwelderia lubrica Zhu et Zhang in Qiu et al., 1983;1.CZM000078,头盖;2.CZM000064-5,头盖;3.CZM000079,头盖; 4.CZM000080,头盖;5.CZM000062-2,头盖;6.CZM000081,尾部;7.CZM000082,尾部;8.CZM000083,尾部;9.CZM000084,尾部;10.CZM000085,尾部;11.CZM000069-3,活动颊;12.CZM000086,活动颊;13.CZM000087,活动颊;14.CZM000088,活动颊;15.CZM000089,活动颊。16—20.Blackwelderia sinensis(Airaghi,1902);16.CZM000098,头盖;17.CZM000099,头盖;18.CZM000090,尾部;19.CZM000091,尾部;20.CZM000092,尾部; 21—25.Blackwelderia paronai(Bergeron,1899);21.CZM000100,头盖; 22.CZM000101,头盖;23.CZM000102,头盖;24.CZM000095,尾部;25.CZM000103,尾部。26—30.Parablackwelderia spectabilis (Resser and Endo, 1937);26.CZM000104,头盖; 27.CZM000105,头盖;28.CZM000106,尾部;29.CZM000107,尾部;30.CZM000108-1,尾部

Fig.4 Trilobites from the Cambrian Upper Changhia Formation in northern Anhui

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