Horlick Formation lithofacies 6 (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; phosphatic, shelly/skeletal 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 6 interpreted as "lag deposits on the seaward flanks of outer shoreface sand-tongues"
• "Very thin, usually poorly sorted sandstones, containing a high proportion of phosphatic clasts, including inarticulate brachiopods, trilobite fragments, fish material, and rounded pebbles of phosphatized mudstone. Fragmented shells also occur. It grades laterally into Lithofacies 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 35564: authorized by Michael Foote, entered by Michael Foote on 21.12.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Phacopida - Homalonotidae
Bivalvia
 Modiomorphida - Modiomorphidae
 Pholadomyida -
Obrimia hadrosa n. sp. clam
 Protobranchia - Malletiidae
Nuculites frigidus n. sp. clam
Gastropoda
 Bellerophontida - Plectonotidae
Plectonotus derbyi Clarke 1899 snail
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
unclassified
  -
Chordata indet. Haeckel 1847
"fish material"
Chondrichthyes
 Acanthodei - Acanthoessidae
Machaeracanthus sp. Newberry 1857 shark
Rhynchonellata
 Terebratulida - Meganterididae
Lingulata
 Lingulida - Disciniidae
 Lingulida - Lingulidae
Lingula sp. BruguiƩre 1797