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) equigranular limestone facies; 8) INEQUIGRANULAR LIMESTONE FACIES.
• group of beds-level stratigraphic resolution
Environment/lithology: lithified, shelly/skeletal 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 43371: authorized by Austin Hendy, entered by Austin Hendy on 12.08.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Chlorophyceae | |
Cymopolia sp. Lamouroux 1816 | |
Ulvophyceae | |
Halimeda sp. Lamouroux 1812 | |
Anthozoa | |
Astreopora sp. Blainville 1830 stony coral | |
Trochoseris florescens Felix 1921 stony coral
Leptoseris floriformis Gerth 1923 stony coral | |
Gastropoda | |
Trochus sp. Linnaeus 1758 top snail | |
"Turritella cf. spolongensis" = Turritella (Archimediella) spolongensis, "Turritella cf. javana" = Zaria javana
"Turritella cf. spolongensis" = Turritella (Archimediella) spolongensis Martin 1916 turret shell
"Turritella cf. javana" = Zaria javana Martin 1882 turret shell | |
Strombus sp. Linnaeus 1758 conch | |
Vermetus sp. Daudin 1800 worm shell | |
Bivalvia | |
Barbatia (Barbatia) sp. Gray 1842 clam
Acar domingensis Lamarck 1819 miniature ark | |
Spondylus sp. Linnaeus 1758 scallop | |
"Lithophagus sp." = Modiola (Lithophagus)
"Lithophagus sp." = Modiola (Lithophagus) Megerle 1811 mussel | |
"Echinochama sp." = Arcinella
"Echinochama sp." = Arcinella Schumacher 1817 jewel box | |
"Venus (Chione) listeri" = Periglypta listeri
"Venus (Chione) listeri" = Periglypta listeri Gray 1838 venus clam | |
"Cardium (Fragum) javanum" = Fragum
"Cardium (Fragum) javanum" = Fragum cockle | |
Tellina sp. Linnaeus 1758 tellin clam | |
Ensis sp. Schumacher 1817 clam | |
Echinoidea | |
Parasalenia sp. n. sp.
Parasalenia sp. n. sp. sea urchin | |
Schizaster sp. n. sp.
Schizaster sp. n. sp. Agassiz 1835 heart urchin | |
"Sismondia polymorpha" = Echinocyamus polymorpha
"Sismondia polymorpha" = Echinocyamus polymorpha Duncan and Sladen 1883 sand dollar Subspecies: Sismondia polymorpha = S. convexa (Nisiyama)
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