Emigrant Springs Formation

The Emigrant Springs Formation is a geologic formation in Nevada. It preserves fossils dating back to the Cambrian period.

Geology

The Emigrant Springs Formation contains three members, which are as follows, in ascending age:

Members

Member A: This member is the thinnest, only getting up to thick, and is composed of medium-gray, thin to medium-bedded calcisiltite and calcilutite, with breccia's in the upper beds of the member.Member B: This member is the thickest, getting up to thick, and is dominated by light-olive-gray, yellowish or pink calcisiltite, which contains silt-sized quartz grains. At the base of this member, there are also mudstones present, transitioning to medium-light-gray, thin to thick-bedded calcisiltite and calcilutite above.Member C: This member can get up to thick, and is primarily composed of medium-gray oolitic calcarenite, calcilutite and calcisiltite.

Paleobiota

The Emigrant Springs Formation contains a small number of trilobites, and a collection of conodonts, and various molluscs.

Chordata

Genus	Species	Notes	Images
Hertzina	H. bisulcata	Furnishinid paraconodont.
Westergaardodina	W. muelleri	Westergaardodinid paraconodont.
Furnishina	F. asymmetricaF. furnishiF. bicarinata	Furnishinid paraconodont.
Distacodus	D. palmeri	Distacodontid conodont.
Oneotodus	O. tenuis	Protopanderodontid tenuis.

Lophotrochozoa

Genus	Species	Notes	Images
Helcionella	Helcionella sp.	Helcionellid mollusc.
Scenella	Scenella sp.	Scenellid mollusc.
Canthylotreta	C. crista	Acrotretid brachiopod.
Lingulella	Lingulella sp.	Obolid brachiopod.
Livnarssonia	L. ophirensis	Brachiopod.
Paterina	Paterina sp.	Brachiopod.