Skip to Main Content

Biofacies interpretation of Star Peak and partly equivalent basinal conodonts is based upon sedimentologically and paleontologically determined lithofacies relationships as well as a regional paleogeographic model.

Late Spathian transgression initiated Star Peak sedimentation. Deep shelf conditions represented by the lower member of the Prida Formation supported an abundant neospathodid fauna (Neospathodus homeri and N. triangularis) succeeded by a neogondolellid fauna (Neogondolella jubata and N. timorensis). At the same time, restricted shallow marine waters to the east were sparsely populated by neogondolellids (Tobin and Dixie Valley Formations). During the Anisian, deep shelf conditions characterized all of Star Peak deposition (Fossil Hill Member). Conodont distribution was fairly uniform and again dominated by neogondolellids (N. regale, N. bulgarica, N. shoshonensis, N. constricta, N. navicula and N. mombergensis). Ladinian progradation of a carbonate platform across the shelf resulted in a diversification of environments. None was hospitable to conodonts. The platform slope lithology (upper Prida) is apparently barren. Rare neogondolellids occur in restricted shallow marine deposits of the Home Station Member (Augusta Mountain Formation) but are absent from the supratidal Panther Canyon Member. Carinella mungoensis is abundant only in well-bedded open marine sediments within the predominantly massive Smelser Pass Member.

Shelf sedimentation was interrupted in the Karnian. Meanwhile, late Karnian oceanic basin sedimentation to the west (Jackson Mountains) was characterized by N. polygnathiformis and, into the Norian, Epigondolella ?abneptis subsp.A. Resumption of shelf sedimentation occurred during the early Norian (Cane Spring Formation). The sparse conodont fauna consists mainly of E. abneptis subsp.B.

You do not currently have access to this chapter.

Figures & Tables

Contents

References

Related

Citing Books via

Related Book Content
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal