27
3
August
537
548
ALI, O. E. 1984. Sclerochronology and carbonate production in some Upper Jurassic reef corals. Palaeontology, 27, 3, 537–548.
Omer E. Ali Annual banding evident from epithecal increments and associated internal structural changes in phaceloid and massive Oxfordian corals show a range in growth rate from 5 to 10 mm yr-1 in branching colonies (Thecosmilia) and 1.5 to 3 mm yr-1 for massive colonies (Thamnasteria, Fungiastraea, Isastraed). High- and low-density growth bands are identified in massive colonies. The denser part of each couplet is consistently the broader, in contrast with that of most shallow-water modern corals. This is interpreted as due to high local turbidity. The formation time for two sections is estimated with gross carbonate production of 2000 to 3300 g CaCO3m2 yr-1. The Palaeontological Association (Free Access)