k AUG - 2 1921 ^ 



THE 



AMERICAN JOURNAL OF SCIENCE 



[FIFTH SERIES.] 



Aet. V. — Llano ria, the Paleozoic Land Area in Louis- 

 iana and Eastern Texas'^ ; by Hugh D. Miser. 



Contents. 

 Introduction. 



General geology of the Ouachita Mountains and Arkansas Valley. 

 Evidence for a Paleozoic land area in Louisiana and eastern Texas and its 

 features. 



General character of Ordovician and Silurian rocks in Ouachita Moun- 

 tains. 



Blakely sandstone of Ouachita Mountains. 



Blaylock sandstone of Ouachita Mountains. 



Stanley shale and Jackfork sandstone of Ouachita Mountains. 



Tuffs of Mississippian age in the Ouachita Mountains. 



Pennsylvanian rocks in Arkansas and Oklahoma. 

 ■ Ice-borne bowlders in Caney shale in Oklahoma. 



Veatch on source of Paleozoic sediments in Ouachita Mountains. 



Pennsylvanian rocks of north-central Texas. 



Carbon ratios of Pennsylvanian coals in northern Texas. 



Thickness and extent of sediments derived from Llanoria. 



Age and thickness of the exposed rocks of the Gulf Coastal Plain. 



Structure of the Gulf Coastal Plain. 



Concealed rocks of the Gulf Coastal Plain. 



Deformation of rocks in the Arbuckle and Ouachita Mountains. 



Buried Pennsylvanian hills in northern Texas and southern Oklahoma. 



Trans-Mississippian extension of Appalachian land area. 



Llanoria as a positive element and its location by paleogeographers. 

 Conclusions. 



Introduction. 



Evidence for a Paleozoic land area that occupied at 

 least a part of Louisiana and eastern Texas has been 

 published from time to time within the last 30 years by 

 different geologists. The most important paper on the 

 subject is one by J. C. Brainier/ published in 1897. In 



" Published by permission of the Director of the U. S. Geological Survey. 



^ Branner, J. C, The former extension of the Appalachians across Missis- 

 sippi, Louisiana, and Texas, this Journal, (-1), vol. 4, pp. 357-371, 1897. 

 Abstract, Brit. Assoc. Adv. Sci., Eept. 1897, pp. 643-644, 1898. Abstract 

 Annales de Geographie, 7-me Annee, No. 35, pp. 345-346, Sept. 15, 1898. 

 Abstract, Nature, vol. 56, p. 70, Nov. 18, 1897. Eeview by A. H. Purdue, 

 Jour. Geology, vol. 5, pp. 759-760, 1897. 



Am. Jour. Sci. — Fifth Series, Vol. II, No. 8. — August, 1921. 

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