Chert Block LA 14, Lubok Antu Melange, Sarawak, Malaysia (Jurassic of Malaysia)

Where: Malaysia (1.1° N, 111.9° E: paleocoordinates 9.2° N, 123.7° E)

• coordinate estimated from map

• hand sample-level geographic resolution

When: Late/Upper Tithonian (150.8 - 145.0 Ma)

• Ristola altissima Zone (Zone 4)

• bed-level stratigraphic resolution

Environment/lithology: basinal (siliceous); lithified chert and lithified, cherty/siliceous mudstone

• chert blocks found as exotic blocks in the Lubok Antu Melange. The chert blocks consist of interbedded radiolarian cherts and siliceous mudstone.The thickness of the individual chert layers ranges from 1 to 10 cm. The cherts are folded and some parts are fractured and sheared.

Size class: microfossils

Collection methods: bulk, hydroflouric,

• The Radiolaria were retrieved from the chert by using hydrofluoric acid following the method of Pessagno and Newport (1972)

Primary reference: B. Jasin. 1996. Late Jurassic to Early Cretaceous Radiolaria from chert blocks in th Lubok Antu melange, Sarawak, Malaysia. Journal of Southeast Asian Earth Sciences 13(1):1-11 [W. Kiessling/T. Schossleitner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 69299: authorized by Wolfgang Kiessling, entered by Thomas Schossleitner on 24.02.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• common (more than 20 specimens); few (11-19 specimens); rare (6-10 specimens); present (l-5 specimens)
Radiolaria
 Nassellaria - Archaeodictyomitridae
Archaeodictyomitra excellens Tan Sin Hok 1927 radiolarian
 Nassellaria - Unumidae
Protunuma sp. Ichikawa and Yao 1976 radiolarian
 Nassellaria - Hsuidae
 Nassellaria - Parvicingulidae
Mirifusus baileyi Pessagno 1977 radiolarian
Mirifusus mediodilatatus Rüst 1885 radiolarian
Ristola boesii radiolarian
Ristola altissima Rüst 1885 radiolarian
Parvicingula sp. Pessagno 1977 radiolarian
Parvicingula excelsa Pessagno and Blome 1984 radiolarian
 Nassellaria - Spongocapsulidae
Spongocapsula sp. Pessagno 1977 radiolarian
 Entactinaria - Saturnalidae
Acanthocircus carinatus Foreman 1973 radiolarian
 Spumellaria - Angulobracchiidae
Angulobracchia sp. Baumgartner 1980 radiolarian
 Spumellaria - Xiphostylidae
"Neotripocyclia sp." = Suna
"Neotripocyclia sp." = Suna Wu 1986 radiolarian
 Spumellaria - Stylosphaeridae
"Sphaerostylus lanceola" = Stylosphaera
"Sphaerostylus lanceola" = Stylosphaera radiolarian
 Spumellaria - Tritrabidae
Tritrabs exotica Pessagno 1977 radiolarian
listed as Titrab exotica
 Spumellaria - Patulibracchiidae
Homoeoparonaella gigantea Baumgartner 1980 radiolarian