CONTENTS. 
Preface 9 
Chapter I. Topography and geology 11 
General features 11 
Ordovician system 12 
Silurian system 13 
Devonian system 13 
Carboniferous system 14 
Mississippian series 14 
Boone formation 14 
Moorefield shale 14 
Batesville sandstone 14 
Fayetteville formation 15 
Pitkin limestone 15 
Pennsylvania series 15 
Morrow formation 15 
Winslow formation 15 
Hartshorn sandstone 17 
McAlester group 17 
Savanna formation 17 
Occurrences preceding the Cretaceous 18 
Cretaceous system 18 
Tertiary system 18 
Quaternary system 19 
Chapter II. Character, origin, occurrence, and uses of Arkansas clays 20 
Classification of the clays 20 
Residual clays 20 
Clays of mechanical origin ^<Ai& ^4 
Kaolin s** 24 
Pottery clays 26 
Clays for drain tiles 27 
Buckshot clays 28 
Character 28 
Origin 28 
Uses , 29 
The loess 29 
Slope soils 31 
Clays and kaolin of chemical origin 32 
Bauxite 32 
Chapter III. Geologic age and geographic distribution of the clays 34 
Conditions governing distribution 34 
Paleozoic clays and shales 34 
Cretaceous and Tertiary clays 36 
Quaternary clays 43 
Remarks on the analyses 45 
Chapter IV. Report by counties 47 
Arkansas County 47 
Ashley County ................... 48 
