Ooids Washed into Low Energy Micrites Cretaceous (O/39/Cret/Tex)

2.5 cross nicols
2.5 wave plate
5x wave plate
Outstanding feature High Energy Ooids & Bioclasts - Micrite Matrix
Folk Classification Fossiliferous Oomicrite
Dunham Classification Fossiliferous Oolitic Packstone
Common Grains Ooids, Molluscan Fragments, Echinoids & Quartz
Micritization & envelopes Common to pelecypod tests
Cement & diagenetic fabric Common to pelecypod tests
Porosity None
Depositional Setting Low energy shoal to lea of high energy shoal
Diagenetic history Micritization of fossil particles and ooids

Striking mix of high energy grains within micrite matrix suggests juxtoposition of the low and high energy settings. Radial calcitic ooid cortex is concentricly layered about nucleae of both micritic pelloids and fossils. Other transported grains include grapestones and broken fossil tests (oysters, thin shelled pelecypods, & gastropods). Darkened spots within ooid layers and micrite envelopes are cyanobacteria colonies that caused local micritization when high energy grains came to rest in this setting. Common stylolites show disolution at their boundaries and concentration of the insoluble angular quartz silt common dispersed through the sample.

Thursday, November 11, 2021
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