San Saba River, at Menard-Mason border, near Twentymile Crossing (Ordovician of the United States)

Where: Menard County, Texas (30.9° N, 99.5° W: paleocoordinates 19.4° S, 90.6° W)

• outcrop-level geographic resolution

When: Rossodus manitouensis conodont zone, Tanyard Formation (Ellenburger Group), Gasconadian (485.4 - 477.7 Ma)

• Originally given as lower Ellenburger formation, but this is now known as the Tanyard. This is now Skullrockian, but as this overlaps with the latest Cambrian, I'm keeping Gasconade.

•Tribes Hill equivalent?

• formation-level stratigraphic resolution

Environment/lithology: white limestone

Size class: macrofossils

Primary reference: C. L. Dake and J. Bridge. 1932. Faunal correlations of the Ellenburger limestone of Texas. Geological Society America Bulletin 43:725-741 [P. Wagner/P. Wagner/P. Wagner]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 56501: authorized by Pete Wagner, entered by Pete Wagner on 20.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

 Euomphalina - Macluritidae
"Eccyliomphalus gyroceras" = Macluritella gyroceras
"Eccyliomphalus gyroceras" = Macluritella gyroceras Roemer 1852 snail
 Euomphalina - Ophiletidae
"Ophileta polygyrata" = Ophileta polygyratus
"Ophileta polygyrata" = Ophileta polygyratus Roemer 1849 snail