Longing Gap Radiolarians, K 30b (Jurassic of Antarctica)

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

• coordinate based on unpublished field data

• hand sample-level geographic resolution

When: Longing Member (Ameghino Formation), Early/Lower Tithonian (150.8 - 145.0 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 46966: authorized by Wolfgang Kiessling, entered by Wolfgang Kiessling on 27.01.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Protozoa
 Spumellaria - Emiluviidae
? Emiluvia aff. pessagnoi Foreman 1973 radiolarian
Author = Foreman
Emiluvia parvinodosa Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
 Spumellaria -
Spongiomma "sp. B" Haeckel 1887 radiolarian
 Spumellaria - Pyramispongiidae
? Pyramispongia "sp. A" Pessagno 1973 radiolarian
 Spumellaria - Spongodiscidae
Spongodiscus "sp. A" Ehrenberg 1854 radiolarian
Spongodiscus "sp. B" Ehrenberg 1854 radiolarian
 Spumellaria - Tritrabidae
Neoparonaella delicata Yang 1993 radiolarian
Author = Yang
 Spumellaria -
 Spumellaria - Hagiastridae
Crucella magna Blome 1984 radiolarian
Author = (Blome)
Crucella mexicana Yang 1993 radiolarian
Author = Yang
 Spumellaria - Parvivaccidae
Acastea diaphorogona Foreman 1973 radiolarian
Author = (Foreman)
 Spumellaria - Praeconocaryommidae
Praeconocaryomma "sp. A" Pessagno 1976 radiolarian
? Praeconocaryomma "sp. H" Pessagno 1976 radiolarian
 Spumellaria - Pantanelliidae
Pantanellium whalenae Pessagno and MacLeod 1987 radiolarian
Author = Pessagno and MacLeod
Pantanellium formosum Yang 1993 radiolarian
Author = Pessagno
Pantanellium deflectum Yang 1993 radiolarian
Author = Yang
Pantanellium cantuchapai Pessagno and MacLeod 1987 radiolarian
Author = Pessagno and MacLeod
Pantanellium quintachillaense Pessagno and MacLeod 1987 radiolarian
Author = Pessagno and MacLeod
Pantanellium meraceibaense Pessagno and MacLeod 1987 radiolarian
Author = Pessagno and MacLeod
 Spumellaria - Orbiculiformidae
Spongostaurus australis Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
? Orbiculiforma hullae Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
 Spumellaria - Angulobracchiidae
Paronaella denudata Rüst 1898 radiolarian
Author = (Rüst)
Paronaella aff. solanoensis Pessagno 1971 radiolarian
Author = Pessagno
 Spumellaria - Archaeospongoprunidae
Archaeospongoprunum aff. helense Blome 1984 radiolarian
Author = Blome
 Radiolaria - Actinommidae
Actinomma longinggapensis Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
 Actinommacea - Xiphostylidae
Tripocyclia crassa Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
 Nassellaria - Parvicingulidae
Tethysetta boesii Parona 1890 radiolarian
Author = (Parona)
Parvicingula "sp. A" Pessagno 1977 radiolarian
Parvicingula excelsa Pessagno and Blome 1984 radiolarian
Author = Pessagno and Blome
Parvicingula aff. excelsa Pessagno and Blome 1984 radiolarian
Author = Pessagno and Blome
Parvicingula aff. colemani Pessagno and Blome 1984 radiolarian
Author = Pessagno and Blome
Parvicingula judae Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
Praeparvicingula "sp. B" Pessagno et al. 1993 radiolarian
? Praeparvicingula "sp. C" Pessagno et al. 1993 radiolarian
? Praeparvicingula "sp. E" Pessagno et al. 1993 radiolarian
Praeparvicingula nebulosa Hull 1995 radiolarian
Author = Hull
? Praeparvicingula proiecta n. sp. Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
Praeparvicingula vera Pessagno and Whalen 1982 radiolarian
Author = (Pessagno and Whalen)
Praeparvicingula holdsworthi Yang 1993 radiolarian
Author = (Yang)
Praeparvicingula rotunda Hull 1995 radiolarian
Author = Hull
Praeparvicingula aff. rotunda Hull 1995 radiolarian
Author = Hull
"Parvicingula aff. grantensis" = Praeparvicingula grantensis Pessagno and Whalen 1982 radiolarian
Author = (Pessagno and Whalen)
 Nassellaria -
? Windalia "sp. E" Ellis 1993 radiolarian
 Nassellaria - Sethocapsidae
Arcanicapsa aff. adrianae Jud 1994 radiolarian
Author = (Jud)
 Nassellaria - Pseudodictyomitridae
Loopus primitivus Matsuoka and Yao 1985 radiolarian
Author = (Matsuoka and Yao)
 Nassellaria - Eucyrtidiidae
Stichomitra "sp. B" Cayeux 1897 radiolarian
Stichomitra "sp. C" Cayeux 1897 radiolarian
Pseudoeucyrtis "sp. B" Pessagno 1977 radiolarian
 Nassellaria - Williriedellidae
? Tricolocapsa aff. campana Kiessling 1995 radiolarian
Author = Kiessling
Williriedellum frequens Tan Sin Hok 1927 radiolarian
Author = (Tan Sin Hok)
 Nassellaria - Tripedurnulidae
? Tridentocyrtis "sp. B" Steiger and Steiger 1994 radiolarian
 Entactinaria - Hexastylidae
? Hexastylus "sp. A" Haeckel 1881 radiolarian
 Entactinaria - Saturnalidae
Acanthocircus breviaculeatus Donofrio and Mostler 1978 radiolarian
Author = Donofrio and Mostler