foraminifera: part x - foram test shapes & apertures geol 3213 micropaleontology
Post on 11-Jan-2016
264 Views
Preview:
TRANSCRIPT
Microscopes used in Studies
• Transmitted light – whole mounts• Transmitted light – thin sections• Reflected light• SEM
Generalized History Based on Wall Composition & Structure• Note:
– Early organic walled & arenaceous forams in Cambrian
– Calcareous microgranular forams in Ordovician
– Porcelaneous in Carboniferous
– Hyaline in Permian– Planktic in Late Jurassic– Nummulitids = Late K to
Early Cenozoic
CLIMATE CHANGES INTERPRETEDFROM DEEP-SEA CORES
• O18/O16 ratios from used to determine – Paleotemperature changes with planktic species & – Ice-volume changes with benthic species
Triserial, planktic
top related