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Biology Articles » Paleobiology » Micropaleobiology » Decastronema kotori gen. nov., comb. nov.: a mat-forming cyanobacterium on Cretaceous carbonate platforms » Changes in carbonate platforms and their microbiota

Changes in carbonate platforms and their microbiota
- Decastronema kotori gen. nov., comb. nov.: a mat-forming cyanobacterium on Cretaceous carbonate platforms

Here we have compared cyanobacteria of similar structure and comparable habitat separated by 60-70 million years of geological time. Andros Island is the largest of a number of emergent portions of the Bahama carbonate platform, surrounded by extensive areas of shallow waters not more than a few meters deep. The sediment build-up on the platform, continuous since Mesozoic times, shows that its constructon kept abreast of repeated changes in sea level. In southern Europe where Decastronema lived the development of carbonate platforms of similar age and lithology was interrupted by Alpine orogeny following the collision of African and Eurasian continental plates. The carbonate environments compared here may have had a common origin as parts of a series of Mesozoic platforms along the southern margins of the Tethys Sea (D'Argenio, 1970). The western portion of these platforms escaped destruction by Alpine orogenesis as the Atlantic Ocean widened, and continued to exist on the stable trailing end of the North American continent. Contemporaneous strata on both platforms were analyzed and found to be lithologically identical (D'Argenio et alii, 1975). Here we add paleontological support to the similarities in lithological and paleoenvironmental properties reported independently by others.

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