ammonites
Chert Block LA 12, Lubok Antu Melange, Sarawak, Malaysia (Cretaceous to of Malaysia)

Where: Malaysia (1.1° N, 111.8° E: paleocoordinates 14.3° N, 122.3° E)

• coordinate estimated from map

• hand sample-level geographic resolution

When: Late/Upper Albian to Late/Upper Albian (105.3 - 93.5 Ma)

• some radiolarians of this assemblege are indicative of the Obesacapsula somphedia Zone (Schaaf, 1981)

• 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 69296: authorized by Wolfgang Kiessling, entered by Thomas Schossleitner on 24.02.2007