Alan Mountain upper member (upper part), Alan Mountain Limestone (Carboniferous of the United States)

Where: Montana (47.4° N, 105.6° W: paleocoordinates 5.8° S, 39.8° W)

• coordinate based on political unit

• basin-level geographic resolution

When: upper Member (Alan Mountain Limestone Formation), Osagean (353.8 - 342.8 Ma)

• "Mississippian, Osage?", upper part horizon

• group of beds-level stratigraphic resolution

Environment/lithology: marine; cherty/siliceous limestone

• "thick bedded ls and dolomitic ls; finely xtalline; irreg. bedding; chert. BA4"

Size class: macrofossils

Primary reference: M. R. Mudge, W. J. Sando, and J. T. Dutro, Jr. 1962. Mississippian Rocks of Sun River Canyon Area, Sawtooth Range, Montana. AAPG Bulletin 46(11):2003-2018 [M. Uhen/J. Ju/J. Ju]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 555: authorized by Jack Sepkoski, entered by Mike Sommers on 14.01.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Mudge et al. 1962"
Ostracoda
 Podocopida - Bairdiidae
Bairdia sp. M'Coy 1844 ostracod
originally entered as "Biardia sp."
Strophomenata
 Productida - Productidae
 Orthotetida - Schuchertellidae
? Schuchertella sp. Girty 1904
originally entered as "? Schuchertella sp."
 Strophomenida -
Strophomenida indet. Opik 1934
orthotetid brachiopod
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Rhynchonellata
 Athyridida - Athyrididae
Cleiothyridina sp. Buckman 1906
Composita sp. Brown 1849
 Spiriferinida - Punctospiriferidae
? Punctospirifer sp. North 1920
originally entered as "? Punctospirifer sp."
 Spiriferinida - Dimegelasmidae
Dimegelasma sp. Cooper 1942
 Spiriferinida - Syringothyrididae
? Syringothyris sp.
originally entered as "? Syringothyris sp."
 Spiriferida - Spiriferidae
Spirifer sp. Sowerby 1818
3 species
 Spiriferida - Brachythyrididae
Brachythyris sp. M'Coy 1844
 Spiriferida - Elythidae
? Torynifer sp.
originally entered as "? Torynifer sp."
 Rhynchonellida - Trigonirhynchiidae
? Rhynchotreta sp. Hall 1879
originally entered as "? Rhynchotreta sp."
Gastropoda
 Euomphalina - Euomphalidae
Straparollus sp. de Montfort 1810 snail
(Euomphalus)
 Archaeogastropoda -
Archaeogastropoda indet. Thiele 1925 snail
high spired gastropod, not Loxonema
Stenolaemata
 Fenestrida - Fenestellidae
Fenestella sp. Lonsdale 1839
Anthozoa
 Auloporida - Syringoporidae
Syringopora sp. Goldfuss 1826 tabulate coral
 Stauriida - Hapsiphyllidae
Zaphrentites sp. Hudson 1941 horn coral
 Stauriida - Zaphrentoididae
Homalophyllites sp. Easton 1944 horn coral
 Stauriida - Cyathaxoniidae
Cyathaxonia sp. Michelin 1847 horn coral
 Stauriida - Aulophyllidae
Rylstonia sp. Hudson and Platt 1927 horn coral
 Stauriida - Uraliniidae
Vesiculophyllum sp. Easton 1944 horn coral
Enygmophyllum sp. Fomichev 1931 horn coral