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Spongaster pentas

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Journal Article
Published: 01 May 2004
Journal of Micropalaeontology (2004) 23 (1): 39-47.
... Phormostichoartus doliolum Didymocyrtis avita-D. tetrathalamus transition LAD Phormostichoartus fistula LAD Lychnodictyum audax RN10 Phormostichoartus doliolum Interval Zone 4.19–3.82 LAD Didymocyrtis penultima FAD Amphirhopalum ypsilon Spongaster pentas-S. tetras transition LAD Spongaster...
FIGURES
Series: Guidebook
Publisher: The Pacific Section American Association of Petroleum Geologists
Published: 01 January 1996
DOI: 10.32375/1996-GB73.17
EISBN: 9781732014848
FIGURES | View All (16)
Series: Guidebook
Publisher: The Pacific Section American Association of Petroleum Geologists
Published: 01 January 1996
DOI: 10.32375/1996-GB73.17
EISBN: 9781732014841
... (Omatartus) antepenultimus , whose biostratigraphic ranges constrain the date to 5.5-6.0 Ma. Concurrent last and first appearance of the radiolaria Spongaster pentas and Didymorcistis penultimus constrain the date of the uppermost sequence to 3.6 Ma ( Theyer and others, 1978 ). The scarcity...