Longing Gap Radiolarians, K 12 (Jurassic of Antarctica)

Where: Antarctica (64.5° S, 59.0° W: paleocoordinates 55.0° S, 33.2° W)

• coordinate based on unpublished field data

• hand sample-level geographic resolution

When: Longing Member (Ameghino Formation), Late/Upper Kimmeridgian (155.7 - 150.8 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 46960: authorized by Wolfgang Kiessling, entered by Wolfgang Kiessling on 27.01.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Radiolaria
 Nassellaria - Williriedellidae
Zhamoidellum ventricosum Dumitrica 1970 radiolarian
Author = Dumitrica
 Nassellaria - Bagotidae
Droltus "sp. A" Pessagno and Whalen 1982 radiolarian
 Nassellaria - Archaeodictyomitridae
Archaeodictyomitra "sp. C" Pessagno 1977 radiolarian
 Nassellaria - Unumidae
Protunuma japonicus Matsuoka and Yao 1985 radiolarian
Author = Matsuoka and Yao
 Nassellaria - Hsuidae
Hsuum feliformis Jud 1994 radiolarian
Author = Jud
 Nassellaria - Eucyrtidiidae
Pseudoeucyrtis "sp. B" Pessagno 1977 radiolarian
 Nassellaria - Eucyrtiidae
Tetracapsa aff. cometa radiolarian
Author = (Pantanelli)
 Nassellaria -
? Windalia "sp. C" Ellis 1993 radiolarian
 Nassellaria - Tripedurnulidae
? Tridentocyrtis "sp. B" Steiger and Steiger 1994 radiolarian
? Tridentocyrtis ? groissi Steiger and Steiger 1994 radiolarian
Author = Steiger and Steiger
 Nassellaria - Ultranaporidae
Napora aff. bukryi Pessagno 1977 radiolarian
Author = Pessagno
 Nassellaria - Parvicingulidae
Caneta "sp. A" Pessagno et al. 1993 radiolarian
Caneta hsui Pessagno 1977 radiolarian
Author = (Pessagno)
Praeparvicingula "sp. B" Pessagno et al. 1993 radiolarian
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)
Praeparvicingula vera Pessagno and Whalen 1982 radiolarian
Author = (Pessagno and Whalen)
Praeparvicingula holdsworthi Yang 1993 radiolarian
Author = (Yang)
Praeparvicingula blomei Yang 1993 radiolarian
Author = (Yang)
Parvicingula "sp. A" Pessagno 1977 radiolarian
Parvicingula "sp. D" Pessagno 1977 radiolarian
Parvicingula jonesi Pessagno 1977 radiolarian
Author = Pessagno
Parvicingula deadhorsensis Pessagno et al. 1993 radiolarian
Author = (Pessagno, Blome and
Parvicingula yehae Yang 1993 radiolarian
Author = Yang
Parvicingula judae Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
Parvicingula colemani Pessagno and Blome 1984 radiolarian
Author = Pessagno and Blome
Parvicingula aff. colemani Pessagno and Blome 1984 radiolarian
Author = Pessagno and Blome
 Entactinaria - Eptingiidae
Perispyridium "ordinarium" Pessagno 1977 radiolarian
Author = (Pessagno)
 Spumellaria -
Spongiomma "sp. B" Haeckel 1887 radiolarian
Spongiomma "sp. D" Haeckel 1887 radiolarian
Spongiomma "sp. E" Haeckel 1887 radiolarian
 Spumellaria - Angulobracchiidae
Paronaella "sp. A" Pessagno 1971 radiolarian
Paronaella multifera Yang 1993 radiolarian
Author = Yang
Paronaella aff. solanoensis Pessagno 1971 radiolarian
Author = Pessagno
? Angulobracchia ex gr. portmanni Baumgartner 1984 radiolarian
Author = Baumgartner
Angulobracchia cf. biordinalis Ozvoldova 1984 radiolarian
Author = Ozvoldova
 Spumellaria - Praeconocaryommidae
Praeconocaryomma scatebra Hull 1997 radiolarian
Author = Hull
Praeconocaryomma hexagona Rüst 1898 radiolarian
Author = (Rüst)
 Spumellaria - Emiluviidae
Emiluvia aff. hopsoni Pessagno 1977 radiolarian
Author = Pessagno
 Spumellaria - Hagiastridae
Crucella magna Blome 1984 radiolarian
Author = (Blome)
Crucella mexicana Yang 1993 radiolarian
Author = Yang
Higumastra aff. spinosum radiolarian
Author = (Steiger)
Higumastra scassoi Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
Higumastra devilsgapensis Pessagno et al. 1993 radiolarian
Author = Pessagno, Blome and Hull
 Spumellaria - Spongodiscidae
Spongotripus pujanai Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
Teichertus hypnoticus Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
Spongodiscus "sp. A" Ehrenberg 1854 radiolarian
 Spumellaria - Xiphostylidae
Triactoma paramexicana Pessagno and Yang 1989 radiolarian
Author = Pessagno and Yang
 Spumellaria -
 Spumellaria - Orbiculiformidae
Spongostaurus australis Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
? Orbiculiforma "sp. C" Pessagno 1973 radiolarian
Orbiculiforma "sp. D" Pessagno 1973 radiolarian
? Orbiculiforma kanayamaensis Mizutani 1981 radiolarian
Author = Mizutani
Orbiculiforma cf. vacaensis Pessagno 1973 radiolarian
Author = Pessagno
 Spumellaria - Parvivaccidae
Acastea diaphorogona Foreman 1973 radiolarian
Author = (Foreman)
Acaeniotyle parva Yang 1993 radiolarian
Author = Yang
 Spumellaria - Tritrabidae
Neoparonaella "delicata" Yang 1993 radiolarian
Author = Yang