A limestone classified as oomicrite by Folk’s classification but when combining Folk’s and Dunham’s classification it can be classified as :
Oomicrite Packstone
Oomicrite Packstone option is correct.
Folk's carbonate classification labels a limestone by allochems + orthochem: 'oomicrite' means ooids as the dominant grain type set in a micrite (carbonate mud) matrix. Dunham's classification, in contrast, is based on the depositional fabric: mudstone (mud-supported, <10% grains), wackestone (mud-supported, >10% grains), packstone (grain-supported WITH mud matrix), grainstone (grain-supported, no mud) and boundstone (organically bound).
Because oomicrite has enough ooids to form a self-supporting framework but still preserves a micrite matrix in the pores, its Dunham equivalent is packstone. The combined name is therefore 'Oomicrite Packstone'.
Oomicrite Mudstone fails because ooid-rich rocks are not mud-supported; Oomicrite Boundstone requires biological binding not indicated here; and Oomicritic crystalline limestone is a diagenetic textural name, not a Dunham fabric class.
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