Horseshoe Gulch USNM 36439b (Ordovician of the United States)

Also known as Field number Z13c, b3

Where: California (41.4° N, 122.8° W)

• Paleocoordinates: 3.6° S, 132.4° W (Wright 2013)

When: Ashgill (449.5 - 443.7 Ma)

• bed-level stratigraphic resolution

Environment/lithology: lithified packstone and lithified wackestone

• "These lenses have maximum exposed thicknesses of about 50 m, range from bedded to massive, and are commonly skeletal-grain ... lime wackestone-packstone."

Size class: macrofossils

Reposited in the BMNH, USNM

Primary reference: J. K. Rigby and A. W. Potter. 1986. Ordovician sphinctozoan sponges from the eastern Klamath Mountains, northern California. The Paleontological Society Memoir 20 1-47 [A. Miller/S. Kolbe]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 99697: authorized by Arnold Miller, entered by Sarah Kolbe on 19.11.2010

Creative Commons license: CC0 (CC0)

Taxonomic list

• Only sponges are described in this reference.
Show authors, comments, and common names
Rhynchonellata
 Orthida - Dicoelosiidae
Dicoelosia ? jonesridgensis, Epitomyonia relicina
Dicoelosia ? jonesridgensis Ross and Dutro 1966
Epitomyonia relicina Potter 1990
[Epitomyonia recilina]
 Orthida - Draboviidae
Salopina horseshoensis
 Orthida - Linoporellidae
Laticrura aff. erecta, Elasmothyris limata
Elasmothyris limata Potter 1990
 Orthida - Phragmorthidae
Phragmorthis aff. buttsi
Phragmorthis aff. buttsi Cooper 1956
morphotype 1
 Orthida - Giraldiellidae
Scaphorthis "sp. 1"
Scaphorthis "sp. 1" Cooper 1956
 Orthida - Rhactorthidae
Eripnifera praecipitis
 Orthida - Hesperorthidae
Hesperorthis aff. evenkiensis, Ptychopleurella aff. uniplicata, Ptychopleurella aff. mediocostata
 Orthida - Orthidae
? Taphrorthis sp., Diochthofera conspicua, "Paralenorthis cf. parvicrassicostatus" = Sulevorthis parvicrassicostatus
? Taphrorthis sp. Cooper 1956
"Paralenorthis cf. parvicrassicostatus" = Sulevorthis parvicrassicostatus Cooper 1956
 Protorthida - Skenidiidae
Skenidioides multifarius
Strophomenata
 Strophomenida - Hesperomenidae
? Anoptambonites "sp. 1"
Demospongiae
 Agelasida - Sebargasiidae
Amblysiphonella grossa
Amblysiphonella grossa Rigby and Potter 1986 demosponge
 Agelasida - Cliefdenellidae
"Cliefdenella obconica" = Rigbyetia obconica
"Cliefdenella obconica" = Rigbyetia obconica Rigby and Potter 1986 demosponge
 Agelasida - Aphrosalpingidae
Cystothalamiella ducta
Cystothalamiella ducta Rigby and Potter 1986 demosponge
 Agelasida - Preperonidellidae
Imperatoria minima, Imperatoria irregularis, Imperatoria media
Imperatoria minima Rigby and Potter 1986 demosponge
Imperatoria irregularis Rigby and Potter 1986 demosponge
Imperatoria media Rigby and Potter 1986 demosponge
 Verticillitida - Colospongiidae
? Corymbospongia perforata, Corymbospongia adnata
Corymbospongia adnata Rigby and Potter 1986 demosponge