Microscopic

Skeletal - Calcareous Algae - Rhodophytae (Al/1/Eoc/Peru)

2.5x
5x
5x
5x
10x
Outstanding feature Lithoporella laminations
Folk Classification Poorly washed Lithoporella sparite. Laminae are spar filled
Dunham Classification Lithoporella bound-stone and packstone
Common Grains Lithoporella algae
Sorting Poor
Rounding Poor
Micritization & envelopes Some grains affected
Cement & diagenetic fabric Mixture of micrite, & calcite spar late
Porosity Negligible
Depositional Setting Relatively open marine
Diagenetic history Normal dissolution of aragonite, replacement by calcite and filled by calcite spar

Striking sample of Lithoporella with unidentifiable grains in a micrite matrix from the Eocene Atascadera Limestone of Peru, collected by J. Harlan Johnson.


Tuesday, April 28, 2020
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