Page 236 - Carbonate Facies in Geologic History

Facies Sequence in the Permian Reef Complex 223

Table VIII-1 (continued)
General facies Wilson's facies belt Tyrell (1969), Dunham (1972) microfacies
name (Meissner, number and name designation
1972)

Carlsbad 6. Winnowed platform Winnowed shelf sand; skeletal lithoclastic
edge sands dolomite grainstone, with coated grains,
foraminifera, dasycladacean algae, ooids,
thick-shelled gastropods, cross-bedded lime
sand. (Many marine to meteoric vadose sedi-
mentary-diagenetic features.)

Capitan 5. Organic reef of Shelf edge carbonate; lithoclastic skeletal
platform margin lime grainstone and wackestone; bioclastic
debris mixed with lime mud or silt and
boundstone of abundant sessile benthos and
encrusting biota. Bryozoans, red algae,
Tubiphytes, foraminifera, sponges,
brachiopods, crinoids. (Many marine to
meteoric vadose sedimentary-diagenetic
features, e.g., large druse-lined cavities, col-
lapsed beds, large veins filled with coarse
calcite druse.)

Capitan 4. Foreslope facies of Basin slope carbonates; breccia or "reef
carbonate platform tal us;" vague and inclined beds with boulders
(marine talus) and redeposited fossils. Finer grained beds
are lithoclastic-skeletal wackestones, partly
dolomitized

Delaware facies. 3. Deep shelf margin or Basin margin carbonates; dark well-bedded
Thick tongues of basin margin "toe of lithoc1astic skeletal wackestone-packstone,
limestone inter- slope" some very fine-grained. Finer bioclastic
calated with fine debris includes foraminifera and abundant
sandstones (some pieces of organisms living up the slope;
mega-boulder almost all are redeposited. Brachiopods,
beds) bryozoans and crinoids prominent. Many
sedimentary structures including inclined
foresets, slumps, boulder beds, channels, load
casts, carbonate mounds

Delaware facies. 1. Basin Basinal carbonate; black well-bedded, platy,
Thin carbonate laminated micrograded, fine-grained
units intercalated wackestone-packstone with sponge spicules,
with fine globular foraminifera and radiolarians,
sandstone ammonoids

Delaware facies, 1. Basin Starved basin, dark radioactive silty shale
black shale with carbonate beds a few cm. thick
withinfme
sandstone