Longing Gap Radiolarians, K 23 (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• coordinate based on unpublished field data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 46963: 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
 Spumellaria -
Spongiomma "sp. B" Haeckel 1887 radiolarian
Spongiomma "sp. E" Haeckel 1887 radiolarian
 Spumellaria - Spongodiscidae
Spongotripus pujanai n. sp. Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
Spongodiscus "sp. A" Ehrenberg 1854 radiolarian
 Spumellaria - Sponguridae
Spongurus "sp. A" Haeckel 1860 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
? Higumastra "sp. D" Baumgartner 1980 radiolarian
Higumastra scassoi Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
Higumastra cf. inflata Baumgartner 1980 radiolarian
Author = Baumgartner
Higumastra devilsgapensis Pessagno et al. 1993 radiolarian
Author = Pessagno, Blome and Hull
 Spumellaria - Parvivaccidae
Acaeniotyle parva Yang 1993 radiolarian
Author = Yang
 Spumellaria - Praeconocaryommidae
Praeconocaryomma "sp. A" Pessagno 1976 radiolarian
Praeconocaryomma "sp. C" Pessagno 1976 radiolarian
 Spumellaria - Pantanelliidae
Pantanellium whalenae Pessagno and MacLeod 1987 radiolarian
Author = Pessagno and MacLeod
Pantanellium formosum Yang 1993 radiolarian
Author = Pessagno
Pantanellium aff. formosum Yang 1993 radiolarian
Author = Yang
 Spumellaria - Stylosphaeridae
Staurolonche "sp. B" Haeckel 1881 radiolarian
 Spumellaria - Orbiculiformidae
"Orbiculiforma teres" = Orbiculiformella teres Hull 1997 radiolarian
Author = Hull
Spongostaurus "sp. B" Haeckel 1882 radiolarian
Spongostaurus australis Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
Orbiculiforma aff. railensis radiolarian
Author = Pessagno
Orbiculiforma "sp. A" Pessagno 1973 radiolarian
Orbiculiforma "sp. D" Pessagno 1973 radiolarian
? Orbiculiforma kanayamaensis Mizutani 1981 radiolarian
Author = Mizutani
Orbiculiforma cf. iniqua Blome 1984 radiolarian
Author = Blome
Orbiculiforma cf. vacaensis Pessagno 1973 radiolarian
Author = Pessagno
Orbiculiforma "mclaughlini" Pessagno 1977 radiolarian
Author = Pessagno
Orbiculiforma aff. mclaughlini Pessagno 1977 radiolarian
Author = Pessagno
Orbiculiforma lowreyensis Pessagno 1977 radiolarian
Author = Pessagno
 Spumellaria - Pseudoaulophacidae
Alievium "sp. B" Pessagno 1972 radiolarian
? Alievium "sp. C" Pessagno 1972 radiolarian
 Spumellaria - Angulobracchiidae
? Angulobracchia ex gr. portmanni Baumgartner 1984 radiolarian
Author = Baumgartner
Angulobracchia aff. trifolia Steiger 1992 radiolarian
Author = Steiger
Paronaella "sp. B" Pessagno 1971 radiolarian
Paronaella multifera Yang 1993 radiolarian
Author = Yang
Paronaella aff. multifera Yang 1993 radiolarian
Author = Yang
Paronaella aff. cava Ozvoldova 1990 radiolarian
Author = (Ozvoldova)
Paronaella aff. pristidentata Baumgartner 1980 radiolarian
Author = Baumgartner
Paronaella aff. solanoensis Pessagno 1971 radiolarian
Author = Pessagno
Paronaella obesa Pessagno 1977 radiolarian
Author = (Pessagno)
 Spumellaria - Archaeospongoprunidae
Archaeospongoprunum aff. bipartitum Pessagno 1973 radiolarian
Author = Pessagno
 Radiolaria - Actinommidae
Actinomma verwirra Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
Acanthosphaera "sp. B" Ehrenberg 1859 radiolarian
 Actinommacea - Xiphostylidae
Suna echiodes Foreman 1973 radiolarian
ssp. concava, Author = Kiessling, n.ssp.
Triactoma frequens Pessagno et al. 1989 radiolarian
Author = (Pessagno and Yang)
 Nassellaria - Syringocapsidae
Podocapsa amphitreptera Foreman 1973 radiolarian
Author = Foreman
 Nassellaria - Parvicingulidae
Caneta hsui Pessagno 1977 radiolarian
Author = (Pessagno)
Tethysetta boesii Parona 1890 radiolarian
Author = (Parona)
Parvicingula excelsa Pessagno and Blome 1984 radiolarian
Author = Pessagno and Blome
Parvicingula colemani Pessagno and Blome 1984 radiolarian
Author = Pessagno and Blome
Parvicingula jonesi Pessagno 1977 radiolarian
Author = Pessagno
Parvicingula bluefordae Hull 1995 radiolarian
Author = Hull
Praeparvicingula "sp. A" Pessagno et al. 1993 radiolarian
Praeparvicingula "sp. B" Pessagno et al. 1993 radiolarian
Praeparvicingula blomei Yang 1993 radiolarian
Author = (Yang)
 Nassellaria - Amphipyndacidae
? Amphipyndax "sp. A" Foreman 1966 radiolarian
 Nassellaria - Spongocapsulidae
Obesacapsula "sp. A" Pessagno 1977 radiolarian
 Nassellaria -
? Windalia "sp. E" Ellis 1993 radiolarian
 Nassellaria - Archaeodictyomitridae
Archaeodictyomitra exigua Blome 1984 radiolarian
Author = Blome
 Nassellaria - Hsuidae
Hsuum "sp. A" Pessagno 1977 radiolarian
Hsuum mclaughlini Pessagno and Blome 1984 radiolarian
Author = Pessagno and Blome
Hsuum tamanense Yang 1993 radiolarian
Author = Yang
 Nassellaria - Eucyrtiidae
Tetracapsa molengraaffi Tan Sin Hok 1927 radiolarian
Author = (Tan Sin Hok)
 Nassellaria - Eucyrtidiidae
Stichomitra cf. pseudacerra Tan Sin Hok 1927 radiolarian
Author = (Tan Sin Hok)
 Entactinaria - Eptingiidae
Perispyridium trifolium Kiessling 1999 radiolarian
Author = Kiessling, n.sp.
 Entactinaria - Centrocubidae
? Octodendron "sp. A" Haeckel 1887 radiolarian
? Octodendron "sp. B" Haeckel 1887 radiolarian