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Folk’s Classification
Allochem (“Grains”) occur either “floating” In microcrystalline matrix (“micrite”), or packed
Together and cemented with calcite (“spar”).
Analogies: Sandstones Limestones Quartz.........................Grains Clay ............................Micrite Cement .......................Cement Prefix of Rock Name denotes kind of grain: bio ..........fossil intra ........intraclasts (soft sediment “Pebbles) pel...........pellets (faecal in origin) oö............oölites Suffix denotes interstitial material (i.e., micrite or spar)
biomicrite biosparite
oömicrite oösparite
intramicrite intrasparite
pelmicrite pelsparite