Abstract
The middle unit of El Paso Group, 209 m (686 ft) thick, is predominantly a very thick-bedded to massive and nonstratified limestone with a few inclusions of chert nodules and lenses. The limestones are classified into seven standard microfacies (Smf). The standard microfacies are (from most common to least common) Smf-16, Pelsparite; Smf-9, bioclastic wackestone; Smf-18, algal grainstone; Smf-24, lithoclastic grainstone; Smf-23, nonlaminate pure micrite; Smf-15, oolite; and Smf-19, fenstral, peloidal and laminate micrite. The microfacies are further classified into 70 variations more fully and adequately to describe the middle unit rocks of the El Paso Group.
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