Polished slab of a laminated, fenestral, very fine-grained dolomite from the back-reef "lagoonal"
facies of the Seven Rivers Formation. This fabric was most likely produced by intertidal blue-
green algal/cyanobacterial stromatolites; some of the larger voids are the result of dissolution
of synsedimentary evaporite crystals. Sample from roadside outcrop ca. 9 km west of canyon
mouth, Dark Canyon, Eddy Co., NM.


© Peter A. Scholle, 1999


Guadalupe Mtns. geology —— Scholle home page —— NM Bureau staff page —— NM Bureau main page