Horlick Formation lithofacies 8 (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; bioturbated sandstone

• 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 8 interpreted as "steeper parts of subtidal sand bars"
• "Poorly sorted, feldspathic sandstones with indisctinct bedding. Commonly bioturbated, and containing spiriferid brachiopods, large bivalves with bryozoan overgrowths and crinoidal material. Bivalve shells that have silt infills or 'shadows' may indicate burial first in fine sediment, followed by exhumation during storms and incorporation into coarse sand."

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 35566: authorized by Michael Foote, entered by Michael Foote on 21.12.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
ossicles
 Cladida - Botryocrinidae
? Ancyrocrinus sp.
? Ancyrocrinus sp. Hall 1862 Sea lily
Gastropoda
 Bellerophontida - Plectonotidae
Plectonotus derbyi
Plectonotus derbyi Clarke 1899 snail
Bivalvia
 Pholadomyida -
Obrimia hadrosa n. sp.
Obrimia hadrosa n. sp. clam
 Cardiidia - Grammysiidae
"Prothyris (Prothyris) darlingensis n. sp." = Prothyris
"Prothyris (Prothyris) darlingensis n. sp." = Prothyris clam
Rhynchonellata
 Spiriferida - Hysterolitidae
Australospirifer cf. iheringi
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831