Peloidal and skeletal grainstones with fenestral fabric in the
near-back-reef Tansill Formation. These strata were probably
deposited on a relatively high-energy tidal flat. Outcrop
on south side of Dark Canyon, less than 1 km west of the
canyon mouth, Eddy Co., NM. Coin is 2.4 cm in diameter.
© Peter A. Scholle, 1999