PBDB Collection

Longing Gap Radiolarians, K 13 (Jurassic of Antarctica)

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

• 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, 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, replaced with other

Collection methods: bulk, chemical, hydrochloric, sieve,

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

Primary reference: W. Kiessling, R. Scasso, A. Zeiss, A. Riccardi, and F. Medina. 1999. Combined radiolarian-ammonite stratigraphy for the Late Jurassic of the Antarctic Peninsula: Implications for radiolarian stratigraphy. Geodiversitas 21(4):687-713 [W. Kiessling/W. Kiessling/W. Kiessling]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 51836: authorized by Wolfgang Kiessling, entered by Wolfgang Kiessling on 22.06.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Protozoa
Spumellaria - Pantanelliidae	Pantanellium aff. parvulum, Pantanellium rarum, Pantanellium formosum, Pantanellium aff. formosum, Pantanellium deflectum Pantanellium aff. parvulum Pessagno and MacLeod 1987 radiolarian Pantanellium rarum Hull 1997 radiolarian Pantanellium formosum Yang 1993 radiolarian Pantanellium aff. formosum Yang 1993 radiolarian Pantanellium deflectum Yang 1993 radiolarian
Spumellaria - Emiluviidae	Emiluvia hopsoni, Emiluvia aff. hopsoni Emiluvia hopsoni Pessagno 1977 radiolarian Emiluvia aff. hopsoni Pessagno 1977 radiolarian
Spumellaria - Orbiculiformidae	Orbiculiforma cf. quadrata Orbiculiforma cf. quadrata Pessagno 1973 radiolarian
Spumellaria - Parvivaccidae	Acaeniotyle umbilicata, Acaeniotyle parva Acaeniotyle umbilicata Rüst 1898 radiolarian Acaeniotyle parva Yang 1993 radiolarian
Spumellaria -	? Plegmosphaera sp. ? Plegmosphaera sp. radiolarian
Spumellaria - Hagiastridae	Higumastra devilsgapensis Higumastra devilsgapensis Pessagno et al. 1993 radiolarian s.l.
Radiolaria - Actinommidae	Actinomma frigida, Actinomma verwirra Actinomma frigida Kiessling 1999 radiolarian Actinomma verwirra Kiessling 1999 radiolarian
Actinommacea - Xiphostylidae	Triactoma mexicana, Tripocyclia crassa, Suna cf. harperi Triactoma mexicana Pessagno et al. 1989 radiolarian Tripocyclia crassa Kiessling 1999 radiolarian Suna cf. harperi Pessagno et al. 1989 radiolarian
Entactinaria - Eptingiidae	Perispyridium sp., Perispyridium ordinarium Perispyridium sp. Dumitrica 1978 radiolarian Perispyridium ordinarium Pessagno 1977 radiolarian
Nassellaria - Eucyrtiidae	"Tetracapasa molengraaffi" = Tetracapsa "Tetracapasa molengraaffi" = Tetracapsa radiolarian
Nassellaria - Sethocapsidae	Sethocapsa trachyostraca Sethocapsa trachyostraca Foreman 1973 radiolarian
Nassellaria - Ultranaporidae	Napora pualensis, Napora durhami Napora pualensis Blome 1984 radiolarian Napora durhami Pessagno 1977 radiolarian
Nassellaria - Parvicingulidae	Caneta hsui, Praeparvicingula "B", Praeparvicingula vera, Praeparvicingula rotunda, Praeparvicingula blomei, Parvicingula colemani, Parvicingula excelsa, Parvicingula jonesi Caneta hsui Pessagno 1977 radiolarian Praeparvicingula "B" Pessagno et al. 1993 radiolarian Praeparvicingula vera Pessagno and Whalen 1982 radiolarian Praeparvicingula rotunda Hull 1995 radiolarian Praeparvicingula blomei Yang 1993 radiolarian Parvicingula colemani Pessagno and Blome 1984 radiolarian Parvicingula excelsa Pessagno and Blome 1984 radiolarian Parvicingula jonesi Pessagno 1977 radiolarian s.l.
Nassellaria - Amphipyndacidae	Triversus fastigatus Triversus fastigatus Hull 1997 radiolarian
Nassellaria - Tripedurnulidae	Pseudopoulpus "A" Pseudopoulpus "A" Takemura 1986 radiolarian