Where: Puerto Rico (18.1° N, 67.0° W: paleocoordinates 17.1° N, 61.6° W)

• coordinate estimated from map

When: San Germán Formation, Maastrichtian (72.1 - 66.0 Ma)

• ...come from silicified limestones of the San Germán Formation as used by Mattson (1960)

Environment/lithology: lithified, cherty/siliceous limestone

Size classes: macrofossils, mesofossils

• Individual blocks contain different faunal assemblages, and it is obvious that more than one ecologic niche is involved.

•The fauna of the San German Formation at this locality is dominated by rudistid pelecypods and by nerineid and actaeonellid gastropods; but a host of other types of mollusks, an abundance of corals, other invertebrates, and coralline algae also occur. The fauna is obviously a warm-water or tropical type with affinities to the Mediterranean Tethyan region. These Cretaceous tropical-reef, back-reef, and lagoonal associations contrast strongly with the coeval Gulf Coast faunas associated with C. (Chiton) berryi. Of special note is the rarity of rudistid pelecypods and the absence of nerineid and actaeonellid gastropods in the Late Cretaceous Coastal Plain province.

Collection methods: acetic,

• All amphineuran specimens have been recovered from the residue of acidized limestone blocks and are silicified. The outcrops of the limestone at this locality are obscured by slope wash and very dense overgrowth.

Primary reference: A.G. Smith, N.F. Sohl, and E.L. Yochelson. 1968. New Upper Cretaceous Amphineura (Mollusca) Description of chitons from the Gulf Coastal Plain an Puerto Rico. Geological Survey Professional Paper 593-G [B. Seuss/B. Seuss]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 215513: authorized by Barbara Seuss, entered by Barbara Seuss on 12.11.2020

Creative Commons license: CC BY (attribution)