Small shelly fossils from the Montezuman—Delamaran of the Great Basin in Nevada and California
Small shelly fossils from the Montezuman—Delamaran of the Great Basin in Nevada and California
复制标题
DOI：
10.1017/jpa.2017.8
复制
发表时间：
2017-05
影响因子：
1.4
通讯作者：
Thomas Wotte;F. Sundberg
中科院分区：
文献类型：
--
作者：
Thomas Wotte;F. Sundberg
抽象。对大盆地寒武系2- 3统碳酸盐-硅质混合层序中的三叶虫和腕足动物群进行了详细的研究。相比之下，小壳化石大多未被报道。加州东部和内华达州南部的9个剖面产生了一个小的多样性低的贝壳组合，这可能反映了非磷酸盐化和最初钙质遗骸的损失。根据Montezuman-Delamaran阶段，我们报道了Anabarella chelata Skovsted，2006 a，Costipelagiella nevadense Skovsted，2006 a，Pelagiella aff.亚角拟木霉（P. subangulata）（Tate，1892），小角拟木霉（Microcornus sp.）Parkula sp.，Hyolithellus？例如，Allonia sp.，Chestioria sp.，原星藻属A. Hirundo Bengtson in Bengtson et al.，1990年，eooides cf. A. granulatus Qian，1977，以及未定义的棘皮动物和螺旋体类软体动物。Montezuman阶的下半部分产生了许多叶足型的片细胞，如Microdictyon rhomboidale Bengtson，马修斯，and Missarzhevsky，1986，Microdictyon montezumaensis n.例如，和楔微网藻Microdictyon cuneum n. sp.的发生。P. subangulata和Microdictyon种在下Montezuman阶提供了一个基本的潜在的对比与寒武系2/阶段3的基础，中国南方，西伯利亚和阿瓦隆。
Abstract. The mixed carbonate-siliciclastic successions of the Cambrian Series 2–Cambrian Series 3 interval of the Great Basin are well investigated in respect to their trilobite and brachiopod fauna. In contrast, the small shelly fossils have been mostly unreported. Nine sections in eastern California and southern Nevada have produced a small shelly assemblage of low diversity, which likely reflects non-phosphatization and loss of originally calcareous remains. From the Montezuman—Delamaran stages we report Anabarella chelata Skovsted, 2006a, Costipelagiella nevadense Skovsted, 2006a, Pelagiella aff. P. subangulata (Tate, 1892), Microcornus sp., Parkula sp., Hyolithellus? sp., Allonia sp., Chancelloria sp., Archiasterella cf. A. hirundo Bengtson in Bengtson et al., 1990, Archaeooides cf. A. granulatus Qian, 1977, and undefined echinoderms and helcionelloid molluscs. The lower part of the Montezuman Stage delivered a number of lobopodian sclerites as Microdictyon rhomboidale Bengtson, Matthews, and Missarzhevsky, 1986, Microdictyon montezumaensis n. sp., and Microdictyon cuneum n. sp. The occurrence of P. aff. P. subangulata and species of Microdictyon in the lower Montezuman Stage offers a fundamental potential for correlation with the base of Cambrian Series 2/Stage 3 of South China, Siberia, and Avalonia.