Where: Northern Mariana Islands (15.2° N, 145.8° E: paleocoordinates 15.2° N, 148.0° E)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Tagpochau Formation, Early/Lower Miocene (23.0 - 16.0 Ma)
• The Tagpochau Limestone is a complex of calcareous clastic rocks that integrade with one another. The limestone appears to span the Indonesian Tertiary e interval or early Miocene age. Six lithic facies and two members are recognized in the Tagpochau Limestone, and include: 1) Donni Sandstone Member; 2) Machegit conglomerate Member; 3) transitional facies of calcareous tuff and marl; 4) tuffaceous limestone facies; 5) MARLY FACIES; 6) rubbly limestone facies; 7) equigrannular limestone facies; 8) inequigranular limestone facies. The collection is from the Donni Sandstone member occurs near the middle of the formation.
• group of beds-level stratigraphic resolution
Environment/lithology: lithified, fine-grained, brown, white, yellow, argillaceous, calcareous limestone
Size class: macrofossils
Collection methods: quarrying,
• Collections probably reposited in USNM collections, but this is not stated.
Primary reference: P. E. Cloud, Jr, R.G. Schmidt, and H.W. Burke. 1956. Geology of Saipan, Mariana Islands: Part 1. General Geology. United States Geological Survey Professional Paper 280(A):1-126 [A. Miller/A. Hendy/A. Hendy]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 43368: authorized by Austin Hendy, entered by Austin Hendy on 12.08.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
Parvilucina sp. Dall 1901 clam | |
"Cardium (Fragum) javanum" = Fragum
"Cardium (Fragum) javanum" = Fragum cockle | |
"Chlamys (Aequipecten) exageratus" = Aequipecten
"Chlamys (Aequipecten) exageratus" = Aequipecten scallop | |
Acar domingensis Lamarck 1819 miniature ark | |
Gastropoda | |
Cypraea sp. Linnaeus 1758 cowry | |
Xenophora sp. Fischer von Waldheim 1807 carrier shell | |
? Strombus sp. Linnaeus 1758 conch | |
Murex sp. Linnaeus 1758 murex snail | |
Cerithium (Thericium) columna Sowerby l 1834 cerith snail
Cerithium (Ptychocerithium) progoense cerith snail | |
"Turritella ? sedanensis" = Haustator sedanensis, "Turritella cf. javana" = Zaria javana, "Turritella cf. spolongensis" = Turritella (Archimediella) spolongensis
"Turritella ? sedanensis" = Haustator sedanensis Martin 1905 turret shell
"Turritella cf. javana" = Zaria javana Martin 1882 turret shell
"Turritella cf. spolongensis" = Turritella (Archimediella) spolongensis Martin 1916 turret shell | |
Echinoidea | |
"Sismondia polymorpha" = Echinocyamus polymorpha
"Sismondia polymorpha" = Echinocyamus polymorpha Duncan and Sladen 1883 sand dollar = S. convexa (Nisivama)
| |
Echinolampas aff. convacus sea urchin |