Aragonite Planktonics

[gmi267@xxxxxxxxxx]

Thanks to everyone who responded to my query regarding the 
biological mechanisms which govern if an organism produces an 
aragonite or calcite test/shell. (The question arises since its been 
noted that the earliest planktonic foraminifera were aragonitic). I 
received several helpful pointers in the right direction. I think my 
question is on quite a few peoples minds, but there are still no 
definitive answers. I'll let PalaeoNet and Micropal subscribers know if 
any revelations come to light. In the meantime if anyone has any 
further thoughts please let me know.

Thanks again,

Mike 

Dr. Mike Simmons
Department of Geology
University of Aberdeen
Meston Building
King's College
Abderdeen
AB9 2UE
United Kingdom

Tel: 44 - 1224 - 273438
Fax: 44 - 1224 - 272785
m.d.simmons@abdn.ac.uk