期刊
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷 295, 期 1-2, 页码 236-244出版社
ELSEVIER
DOI: 10.1016/j.palaeo.2010.05.041
关键词
Cambrian; Lagerstatte; Poleta Formation; Indian Springs; Taphonomy
资金
- National Science Foundation [EAR-0073089, 0106883]
- School of Earth Sciences, The Ohio State University
- Directorate For Geosciences
- Division Of Earth Sciences [0106883] Funding Source: National Science Foundation
Intervals of exceptional fossil preservation collectively termed the Indian Springs Lagerstatte occur in the middle member of the Poleta Formation (Cambrian, Series 2, Stage 3) in Esmeralda County, Nevada, USA. The preserved macrofauna and taphonomic modes are similar to those of the Spence Shale Lagerstatte of Utah (Cambrian Series 3). The Indian Springs macrofauna mostly consists of biomineralizing organisms such as trilobites, helicoplacoids, hyolithids and inarticulate brachiopods. Multi-element taxa such as helicoplacoids and chancelloriids are commonly articulated. Examples of preserved nonbiomineralized anatomy include mantle setae of brachiopods, demosponge skeletons, hyolithid gut tracts, trilobite appendages, algae, cyanobacteria, and body parts of nonbiomineralizing arthropods. The Indian Springs Lagerstatte is dominated by fine siliciclastics, and was deposited in an offshore shelf setting subjected to storm-initiated sediment pulses. Exceptional preservation was facilitated by obrution-type deposition, presumably in dysoxic or anoxic muds, and in environments where organismic remains were removed from durophagous carnivores and scavengers, including bioturbators. (C) 2010 Elsevier B.V. All rights reserved.
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