L12a_Skeletal Grains_Key

L12a_Skeletal Grains_Key - Key Lab 12 Skeletal Grains...

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Sample 1 1) gastropods 2) coiled about a single, long axis; chambered shells 3) aragonite 4) Cambrian-Recent 5) Gastropod packstone Sample 2 1) Gastropod and bivalve fragments 2) sparite 3) Gastropod-bivalve grainstone Sample 3 1) caprinid rudists 2) pallial canals (wall interiors), spiral or horn shape, high intragranular porosity 3) aragonite 4) reef-builders of Cretaceous period 5) Rudistid boundstone Sample 4 1) 2) doughnut-shaped cross section of plates, plates stack into columns 3) high Mg calcite 4) Ordovician to recent; most common in Mississippian period 5) (4a) Crinoid grainstone; (4b) Crinoid packstone Sample 5 1) crinoids and bivalves (<10%) 2) micrite 3) Mudstone with a ~1cm Crinoid-bivalve wackestone horizon Sample 6 1) bivalves and gastropods 2) Gastropods: coiled, spirals, triangle-shaped molds; Bivalves: disarticulated, curved or fingernail-shaped shells. 3)
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L12a_Skeletal Grains_Key - Key Lab 12 Skeletal Grains...

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