Longing Gap, Graham Land (Jurassic of Antarctica)

Where: Antarctic Peninsula, Antarctica (64.5° S, 59.0° W: paleocoordinates 54.9° S, 35.5° W)

• outcrop-level geographic resolution

When: Longing Member (Ameghino Formation), Early/Lower Tithonian (150.8 - 145.0 Ma)

• Upper part of Longing Member

•Termed Nordenskjöld Fm. should actually be calles Ameghino Fm.

• group of beds-level stratigraphic resolution

Environment/lithology: basinal (); lithified, concretionary, tuffaceous, black mudstone

• Anoxic conditions prevailed especially in the Longing Member; this is indicated by the often lacking bioturbation and rare horizons with benthonic fossils. In the Ameghino Member moderately intense bioturbation (Zoophycos, Chondrites, Planolites) and a consequent destruction of lamination indicate dysaerobic conditions. Doyle and Whitham (1991) attribute this environmental change to an uplift of the depositional environment above a permanent pyknocline. The submarine relief was very low and a simple hemipelagic sedimentation was dominant.

Collection methods: quarrying,

• Macrofossils (others than ammonites) only randomly picked.

Primary reference: A. G. Whitham and P. Doyle. 1989. Stratigraphy of the Upper Jurassic - Lower Cretaceous Nordenskjöld Formation of Graham Land, Antarctica. Journal of South American Earth Sciences 2:371-384 [W. Kiessling/W. Kiessling/W. Kiessling]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 10697: authorized by Wolfgang Kiessling, entered by Wolfgang Kiessling on 26.03.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Oppeliidae
Neochetoceras sp.
 Ammonitida - Perisphinctidae
? Anavirgatites sp., Virgatosphinctes sp.
Virgatosphinctes sp. Uhlig 1910 ammonite
 Ammonitida - Ataxioceratidae
Lithacoceras sp.
Lithacoceras sp. Hyatt 1900 ammonite
 Ammonitida - Neocomitidae
? Kossmatia sp.
? Kossmatia sp. Uhlig 1907 ammonite
 Ammonitida - Aspidoceratidae
Hybonoticeras sp.
Hybonoticeras sp. Breistroffer 1947 ammonite
 Octopoda - Trachyteuthididae
Trachyteuthis sp.
Bivalvia
 Myalinida - Inoceramidae
Retroceramus sp., Retroceramus everesti, Anopaea sp.
Retroceramus sp. Koschelkina 1958 clam
Anopaea sp. Eichwald 1861 clam
 Pectinida - Buchiidae
Buchia sp.
Buchia sp. Rouillier 1845 scallop
 Ostreida - Aulacomyellidae
Aulacomyella willeyi