Longing Gap Radiolarians, K 65 (Cretaceous of Antarctica)

Where: Antarctica (64.5° S, 59.0° W: paleocoordinates 54.9° S, 37.6° W)

• coordinate based on unpublished field data

• hand sample-level geographic resolution

When: Ameghino Member (Ameghino Formation), Early/Lower Berriasian (145.0 - 140.2 Ma)

• bed-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.
• Mudstone concretion with tuff layers

Size class: microfossils

Preservation: concretion

Collection methods: bulk, chemical, hydrochloric, sieve,

• Radiolarians only. Additional faunal elements are sponge spicules and very rare foraminifera.

Primary reference: W. Kiessling. 1999. Late Jurassic radiolarians from the Antarctic Peninsula. Micropaleontology 45(S1):1-96 [W. Kiessling/W. Kiessling]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 46970: authorized by Wolfgang Kiessling, entered by Wolfgang Kiessling on 27.01.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Protozoa
 Spumellaria -
 Spumellaria - Praeconocaryommidae
Praeconocaryomma mammillaria radiolarian
Author = (Rüst)
 Spumellaria - Pantanelliidae
Pantanellium whalenae Pessagno and MacLeod 1987 radiolarian
Author = Pessagno and MacLeod
 Spumellaria - Orbiculiformidae
Spongostaurus "sp. A" Haeckel 1882 radiolarian
 Actinommacea - Xiphostylidae
Archaeocenosphaera ruesti Pessagno et al. 1989 radiolarian
Author = Pessagno and Yang
Archaeocenosphaera gregaria Rüst 1885 radiolarian
Author = Rüst
 Nassellaria - Parvicingulidae
Tethysetta "boesii" Parona 1890 radiolarian
Author = (Parona)
? Parvicingula "sp. B" Pessagno 1977 radiolarian
Parvicingula aff. colemani Pessagno and Blome 1984 radiolarian
Author = Pessagno and Blome
Parvicingula jonesi Pessagno 1977 radiolarian
Author = Pessagno
Parvicingula cf. elegans Pessagno and Whalen 1982 radiolarian
Author = Pessagno and Whalen
Parvicingula aff. thomesensis Pessagno 1977 radiolarian
Author = Pessagno
Parvicingula turrita Rüst 1898 radiolarian
Author = (Rüst)
? Praeparvicingula erecta radiolarian
Author = (Tan Sin Hok)
Praeparvicingula "sp. B" Pessagno et al. 1993 radiolarian
"Praecaneta "discors"" = Praeparvicingula discors Yang 1993 radiolarian
Author = (Yang)
Praeparvicingula aff. holdsworthi Yang 1993 radiolarian
Author = Pessagno, Blome and Hull
Praeparvicingula "rotunda" Hull 1995 radiolarian
Author = Hull
Praeparvicingula aff. rotunda Hull 1995 radiolarian
Author = Hull
? Ristola "sp. A" Pessagno and Whalen 1982 radiolarian
 Nassellaria - Spongocapsulidae
? Spongocapsula "sp. C" Pessagno 1977 radiolarian
Obesacapsula "sp. A" Pessagno 1977 radiolarian
 Nassellaria -
? Windalia "sp. A" Ellis 1993 radiolarian
 Nassellaria - Archaeodictyomitridae
Archaeodictyomitra aff. exigua Blome 1984 radiolarian
Author = Blome
Mita weddellensis Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
 Nassellaria - Hsuidae
Hsuum mclaughlini Pessagno and Blome 1984 radiolarian
Author = Pessagno and Blome
 Nassellaria - Bagotidae
Droltus aff. laseekensis Pessagno and Whalen 1982 radiolarian
Author = Pessagno and Whalen
? Canutus "sp. B" Pessagno and Whalen 1982 radiolarian
 Nassellaria - Ultranaporidae
Napora pualensis Blome 1984 radiolarian
Author = (Blome)
Napora irregularis Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
 Nassellaria - Eucyrtiidae
Tetracapsa aff. cometa radiolarian
Author = (Pantanelli)
 Nassellaria - Eucyrtidiidae
Stichomitra "sp. B" Cayeux 1897 radiolarian
Stichomitra "sp. C" Cayeux 1897 radiolarian
Pseudoeucyrtis "sp. A" Pessagno 1977 radiolarian
Pseudoeucyrtis "sp. B" Pessagno 1977 radiolarian
Pseudoeucyrtis "sp. C" Pessagno 1977 radiolarian
 Nassellaria - Williriedellidae
? Tricolocapsa "sp. A" Haeckel 1881 radiolarian
Williriedellum ruesti Tan Sin Hok 1927 radiolarian
Author = (Tan Sin Hok)
 Nassellaria - Artostrobiidae
Theocampe "sp. A" Haeckel 1887 radiolarian