geo 10 - Lithofacies rocks with a group of characteristics...

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Lithofacies rocks with a group of characteristics that imply a certain origin or history. Ma million years old Mesoproterozoic adjective implying conditions between 1 billon years ago and 1.6 billion years ago. Micrite very fine (1-5 microns) carbonate crystals (either calcite or aragonite ). It composes carbonate mud. Micrite can precipitate from seawater or form from the breakdown of larger carbonate grains. Most modern micrite is the result of calcifying algae. Microbialite a sediment that is demonstrably influenced by micro-organisms. It is similar to the term " stromatolite ", but explicitly implies a biological origin or influence. Microspar crystals that are 4 to 10, sometimes 50 microns in diameter. This term is usually, but not exclusively, used for carbonate minerals. Neoproterozoic adjective implying conditions between 540 million years ago and 1 billion years ago. Ooid a grain consisting of multiple coatings of carbonate (usually calcite and/or aragonite) that precipitated on a nucleus. They are usually round and smooth. They
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This note was uploaded on 01/31/2011 for the course GEL 1 taught by Professor Barfod during the Spring '08 term at UC Davis.

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geo 10 - Lithofacies rocks with a group of characteristics...

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