Horlick Formation lithofacies 7 (Devonian of Antarctica)

Where: Antarctica (84.8° S, 115.0° W: paleocoordinates 34.6° S, 175.6° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Horlick Formation, Early/Lower Devonian (419.2 - 393.3 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; calcareous sandstone and mudstone

• The marine lithofacies 1-8 are interpreted as "shallow inner shelf to shoreline, where storms produced a changing pattern of coarse sand bars and finer troughs." Lithofacies 7 interpreted as "outer shoreface grading into open shelf"
• "Thin, poorly sorted, carbonate-cemented sandstones (up to granule conglomerate with angular quartz and feldspar grains) and mudstones, that are rich in molluscs (bivalves, bellerophontids), tentaculitids, and trilobites, with some brachiopods. Usually associated with Lithofacies 2 and 3"

Collection methods: Taxa are listed as Present, Abundant, Rare.

Primary reference: M. A. Bradshaw and L. McCartan. 1991. Palaeoecology and systematics of Early Devonian bivalves from the Horlick Formation, Ohio Range, Antarctica. Alcheringa 15(1):1-42 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 35565: authorized by Michael Foote, entered by Michael Foote on 21.12.2003, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Phacopida - Homalonotidae
"Burmeisteria (Digonus) antarcticus" = Digonus
"Burmeisteria (Digonus) antarcticus" = Digonus trilobite
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Lophophorata
 Tentaculitida - Tentaculitidae
Tentaculites antarcticus
Hyolitha
  -
Hyolitha indet.
Hyolitha indet. Marek 1963
Rhynchonellata
 Terebratulida - Meganterididae
Pleurothyrella antarctica
Lingulata
 Lingulida - Lingulidae
Lingula sp.
Lingula sp. Bruguiére 1797
 Lingulida - Discinidae
Orbiculoidea cf. baini
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
 Bellerophontida - Plectonotidae
Plectonotus derbyi
Plectonotus derbyi Clarke 1899 snail
Bivalvia
 Ostreida - Pterineidae
? Pterinea sp.
? Pterinea sp. Goldfuss 1832 oyster
 Myalinida - Ambonychiidae
Mytilarca sp., ? Gosseletia sp.
Mytilarca sp. Hall and Whitfield 1869 clam
"From McAlester, 1965"
? Gosseletia sp. Barrois 1882 clam
 Pholadomyida -
Obrimia ovalis n. sp.
Obrimia ovalis n. sp. clam
 Solenida - Konduriidae
Palaeosolen algidus n. sp.
 Solenida - Orthonotidae
Orthonota sp.
Orthonota sp. Conrad 1841 clam
 Modiomorphida - Modiomorphidae
Glossites sp., Modiomorpha herculi n. sp.
Glossites sp. Hall 1885 clam
Modiomorpha herculi n. sp. clam
 Nuculida - Nuculidae
Notonucula cuspidis n. gen. n. sp., Notonucula demissa n. gen. n. sp.
Notonucula cuspidis n. gen. n. sp. Bradshaw and McCartan 1991 nut clam
Notonucula demissa n. gen. n. sp. Bradshaw and McCartan 1991 nut clam
 Nuculanida - Cucullellidae
Nuculites frigidus n. sp.
Nuculites frigidus n. sp. clam
 Nuculanida - Polidevciidae
Phestia cf. viator
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
ossicles