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By Gisela Gerdes

This e-book bargains with microbial mats, stromatolites and lined grains. contemporary and historical stromatolitic ecosystems are defined in peritidal environments, together with siliciclastic, carbonaceous and evaporite-dominated back-barrier platforms. quite a few suitable different types have been unique: - mat-forming microbiota - environmental stipulations controlling mat forms and lithology - bioturbation and grazing. contemporary and old microbial mat structures exhibit a latitudinal association which might be used for paleoclimatological and paleogeographical reconstructions. This publication can be of designated curiosity to sedimentologists, coastal engineers, ecologists, zoologists, salt plant engineers and marine scientists, in addition to to scholars drawn to those fields.

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Scale is 500 pm. C) Inverse grading of sheetflood sediments with water escape trace (or p o s s i b l y escape trace of insect larva). Scale is 1 mm. D) Sediments resulting from slow sinking deposition from suspension consist of silt, clay, plant debris and some coarser siliciclastic fragments. Scale is 250 pm. E) Sheetfloods also transport seagrasses with epiphytic forams. Scale is 1 mm. 29 Since we carried out our field work a p p r o x i m a t e l y two years after last strong sheetflood, exception of evaporites, cause and the the we found all other s e d i m e n t a r y plains w i t h the g u l l y b o t t o m s and sandlobes already carbonate mud or m i c r o b i a l mats.

Sediments: shows said Fig. 3). These to the extreme short term irregularities of water supply salinity Under The type develops mainly along the shallow shelf area which is sub- Biomass accumulates under giving rise to a which is clearly of stromatolitic multilaminated appearance. The dark laminae are created by the predomination of heavily ensheathed filamentous cyanobacteria, light mainly Mieroco~eu8 chthonoplaste8 (Lh-type). laminae (Lv-type) are gel-supported and produced by The unicellular 41 Fig.

Carbonates and and from level III The m a j o r components are dolomite carbonate averages about 5 %. c o m p o n e n t of the clastic calcite and lagoon Mg-calcite Aragonite, w h i c h is an sediments outside, is m o s t l y a minor c o m p o n e n t or c o m p l e t e l y absent w i t h i n the sabkha. We will this return to the q u e s t i o n of in-situ carbonate highly h y p e r s a l i n e m i l i e u w h e n referring to the accretion in development of b i o l a m i n a t e d sediments and m i c r o b i a l habitats.

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