264 C. .1. Reeds— Hunton Formation, of Oklahoma. 



Henryhouse and Haragan Bhales are both exposed here and 

 when taken together ('(institute Tail's middle member. 



Lithology. — The formation consists of alternating l»lue to 

 white shales and thin bedded earthy limestones which weather 

 into yellowish shales on long exposure. It resembles some- 

 what the Henryhouse formation, but instead of a tendency 

 toward massive bedded alternating series of yellow and pink 

 earthy limestones and some shale beds there is here a predom- 

 inance of the shale members and only occasionally thin ledges 

 of earthy or crystalline limestone. The most typical sections 

 were made along Coal and Iiaragan creeks. 



Fawna. — The fossils are numerous and easily obtained close 

 to the streams where weathered shale slopes occur. The fauna 

 contains a considerable number of species that are to be found 

 in the New Scotland shale of the Helderbergian series in the 

 lower Devonian of New York. The names of the species which 

 have been identified that are peculiar to this horizon are the 

 following : 



Characteristic Species of the Haragan Shale (Devonian). 



Favosites venustus, Striatopora issa, Brachiocrinus sp., Edrio- 

 crinus n. sp., Callopora perelegans, Anoplia helderbergce, Atrypa 

 nqdostriata n.var., Alrypina imbricata, Camarotcechia bialveata, 

 Chonetes sp., Gyrtina dalmani, Dalmanella n. sp., Dalmanella 

 subcarinata, Orthostrophia strophomenoides, Spirifer cyclopteras 

 n. var., Stropheodonta crebristriata, Stropheodonta varistriaia, 

 Stropheodonta a. sp., Stropheodonta cf. plamdata, Slrophonella 

 n. sp., Trematospira cf. costata, Conocardium sp., Megambonia 

 sp., Diaphorostoma n. sp., Diaphorostonut ventricosa, Platy- 

 ceras larnellosum, Plafyceras unguiforme, Pleurotomaria n. sp., 

 Tentacnlites gyracanthus, Dawsonoceras n. sp., Dicranurus 

 hamatus, Phacops logani. 



P>ois d' 'Arc limestone (Devonian). 



This formation corresponds to Taff's upper Hunton. It is 

 present wherever the Chimneyhill, Henryhouse and Haragan 

 beds are found except in the northeast limb of the Arbuckle 

 anticline in the vicinity of Honey creek near the "Washita 

 river. There it was eroded previous to the deposition of the 

 overlying Woodford chert. It varies in thickness from to 

 90 feet but has a general average of 60 feet. In the type area 

 along Bois d'Arc creek, Sec. 4, T. 2K, R. 6E., in the north- 

 east corner of the Arbuckles, it has a maximum thickness of 

 only 61 feet. Although the thickness is not as great as that to be 

 found in the Dougherty anticline, or along Haragan creek, the 

 fossils indicate that it is the higher portion of the section 



