FACIES ANALYSIS IN UPPER JURASSIC STROMATOLITES - SUPPORT BY PALYNOLOGICAL AND STABLE-ISOTOPE DATA

Growth and surrounding environment of Upper Jurassic stromatolites fro m North Germany ave been reconstructed by isotope and palynological da ta. The stromatolites are embedded in thick marls. This circumstance l ead to the continuation of anoxic conditions in the sediment throughou t diagenesis. Trapped palynomorphs and plant detritus show an exceptio nally good preservation. The documented plant communities allow a reco nstruction of the surrounding environment. The stromatolites seem to h ave grown in a restricted, marginal marine environment, probably in th e intertidal or shallow subtidal zone. Light delta(13)C-values support the interpretation of growth within a restricted lagoon.