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Fossilized stromatolites exhibit a variety of forms and structures, or morphologies, including conical, stratiform, domal, columnar, [13] and branching types. [14] Stromatolites occur widely in the fossil record of the Precambrian but are rare today. [15]
A bioherm is a landform of organic sedimentary rock enclosed or surrounded by rock of different origin. [2] A biostrome is a distinctly bedded or broadly lenticular sedimentary rock landform. [ 3 ] Krumbein additionally used these terms to distinguish different shapes of stromatolites : "Distinctly bedded, widely extensive, blanketlike build ...
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Collenia are stromatolites made up of convex layers flattened in the center, forming columnar colonies. The microorganisms involved were likely photosynthetic bacteria expiring oxygen. The microorganisms involved were likely photosynthetic bacteria expiring oxygen.
The lack of many well-preserved stromatolites has been proposed as a consequence of ongoing diagenesis during formation. [5] Diagenesis is a weathering process where newly deposited sediments lies on top of the old sedimentary bed, buried and compacted, lithified and uplifted to the surface as sedimentary rocks.
The Gunflint Chert is composed of biogenic stromatolites. [3] At the time of its discovery in the 1950s, it was the earliest form of life discovered and described in scientific literature, as well as the earliest evidence for photosynthesis. [4] The black layers in the sequence contain microfossils that are 1.9 to 2.3 billion years in age.
Paper/foil/LDPE; Aluminium foil/paper/LDPE; PE/aluminium foil/paper; PET/aluminium foil/LDPE; Apart from these nylon, EVOH, EAA, PA, EVA, SiO2 plasma coatings are also used in laminates to give various functional properties. The layer combinations are selected by the engineer depending on the product characteristic, shelf life and extent of ...
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