Author Affiliations +
ANDRZEJ PISERA,1 MICHAEL MARTÍNEZ,2 HERNÁN SANTOS3
1Institute of Paleobiology, Polish Academy of Sciences, ul. Twarda 51/55, 00-818 Warszawa, < >, apis@twarda.pan.pl
2Earth Science Education Program, Universidad del Este, Carolina Campus, Puerto Rico,
3Department of Geology, University of Puerto Rico, Mayaguez Campus