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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 ...
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 ]
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.
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The "speakermen" are ready to be haggled down to a seemingly minuscule price, because the speakers they are selling, while usually functional, actually cost only a tiny fraction of their "list price" to manufacture. The scam may extend to the creation of Web sites for the bogus brand, which usually sounds similar to that of a respected ...
Best practices • Don't enable the "use less secure apps" feature. • Don't reply to any SMS request asking for a verification code. • Don't respond to unsolicited emails or requests to send money.
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