Marathon Uplift, Marathon Fm., Tremadocian (Ordovician of the United States)

Where: Texas (30.2° N, 103.2° W: paleocoordinates 16.5° S, 92.2° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Marathon Formation, Tremadoc (485.4 - 477.7 Ma)

• "lower Marathon Fm."

Environment/lithology: basinal (); gray, green limestone and shale

• "dark gray ls and green to dark sh. deep water? (basinal) BA6."

Size class: macrofossils

Primary reference: J.L. Wilson. 1954. Late Cambrian and Early Ordovician Trilobites from the Marathon Uplift, Texas. Journal of Paleontology 28(3):249-285 [P. Wagner/P. Wagner]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 279: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Wilson 1954"
 Olenida - Olenidae
"Andesaspis sp." = Leptoplastides, Beltella sp.
"Andesaspis sp." = Leptoplastides Raw 1908 trilobite
Beltella sp. Lake 1919 trilobite
 Ptychopariida - Conocoryphidae
? Elyx sp. Brogger 1879 trilobite
originally entered as "? Elyx sp."
 Asaphida - Asaphidae
Asaphellus sp. Callaway 1877 trilobite
 Asaphida - Nileidae
Symphysurina sp. Ulrich 1924 trilobite
 Asaphida - Eurekiidae
Tostonia sp. Walcott 1924 trilobite
 Orthida - Finkelnburgiidae
Finkelnburgia sp. Walcott 1905
 Euomphalina - Ophiletidae
Ophileta sp. Vanuxem 1842 snail
 Graptoloida -
 Panreclinata - Dichograptidae
Clonograptus sp. Nicholson 1873 graptoloid
 Dendroidea -
Bryograptus sp. graptolite