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/M. Foote]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

Trilobita
 Phacopida - Homalonotidae
Bivalvia
 Myalinida - Ambonychiidae
Mytilarca sp. Hall and Whitfield 1869 clam
"From McAlester, 1965"
? Gosseletia sp. Barrois 1882 clam
 Ostreida - Pterineidae
? Pterinea sp. Goldfuss 1832 oyster
 Modiomorphida - Modiomorphidae
Glossites sp. Hall 1885 clam
Modiomorpha herculi n. sp. clam
 Solenida - Orthonotidae
Orthonota sp. Conrad 1841 clam
 Pholadomyida -
Obrimia ovalis n. sp. clam
 Nuculida -
Notonucula cuspidis n. gen. n. sp., Notonucula demissa n. gen. n. sp.
Notonucula cuspidis n. gen. n. sp. clam
Notonucula demissa n. gen. n. sp. clam
 Protobranchia - Malletiidae
Nuculites frigidus n. sp. clam
 Protobranchia - Nuculanidae
Phestia cf. viator pointed nut clam
Gastropoda
  -
Gastropoda indet. Cuvier 1797 snail
 Bellerophontida - Plectonotidae
Plectonotus derbyi Clarke 1899 snail
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
ossicles
Hyolitha
  -
Hyolitha indet. Marek 1963
Lophophorata
 Tentaculitida - Tentaculitidae
Rhynchonellata
 Terebratulida - Meganterididae
Lingulata
 Lingulida - Disciniidae
 Lingulida - Lingulidae
Lingula sp. BruguiƩre 1797