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) limestone 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. Transitional facies is often intervening between the Donni Sandstone member and more traditional facies of the Tagpochau.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; tuffaceous, calcareous marl and volcaniclastic, calcareous conglomerate

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 43364: authorized by Austin Hendy, entered by Austin Hendy on 12.08.2004

Creative Commons license: CC BY (attribution)