BULL. GEOL, SOC, AM. 



VOL. 23, 1911, PL. 23 



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Figure 1. — Boulderet^ showing slickexsided Surface and pressure Crack 

 Ordovician limestone in Caney shale : Talihina, Oklahoma. Photo by Turpin 



l-'KURE 2. — Chemically imtted Peiible of Ordovician (fossiliferous) Limestone 



Sliowinj; slickonsidos on protuberance (above ••Inch"" on scale) where intersected by 

 l)laue of gliding in tlie Caney shales : Taliliina. Oklahoma. Photo by Tiirpin 



SLICKENSIDED PEBBLE AND BOULDERET FROM CANEY SHALES AT TALAHINA, OKLAHOMA 



