A STRATIGRAPHICAL STUDY OF MARY ANN TOWN- 
SHIP, LICKING COUNTY, OHIO/ 
FRANK CARNEY. 
CONTENTS. 
Introduction. 
Physiography. 
a. Former and present drainage lines. 
b. Time of, and cause of, changes in drainage. 
(1) Associated with Wisconsin glaciation. 
(2) In the Illinoian-Wisconsin interval. 
(3) Associated with the Illinoian glaciation. 
(4) Evidence of pre-Illinoian date, and cause. . 
c. Relation of erosion to stratigraphical studies. 
(1) Stream 
(2) Glacia'. 
Stratigraphy. 
a. Formations. 
Cuyahoga formation. 
Black Hand formation. 
Logan formation. 
Pottsville formation. 
(1) Cherty phase of the Sharon. ! 
(2) Coal, “blossoms,” and fire-clays. 
b. Sedimentation. 
(1) In general. 
(2) The Mississippian formations. 
(3) The Pottsville of the Pennsylvanian period. 
c. Geographic influences arising from stratigraphy. 
(1) Water-bearing formations. 
(2) Location of dwellings and highways. 
(3) Another factor in the location of homes. 
(4) Relation between the houses and the formations of rock. 
(a) The Black Hand horizon. 
(b) The Logan horizon. 
(c) The Pottsville horizon. 
^ This stratigraphical study of Mary Ann Township, as well as that of Perry 
Township which was published in Vol. xiii, pp. 1 17-130, plates I-VHI, 1906, of 
the Bulletin of the Scientific Laboratories of Denison University, and which is in- 
