328 CHARLES S. PROSSER 
and 72 miles south of Slate Cut. The entire length of the bank was 
studied and the following section prepared after such examination. 
Toward its upper end, the rocks dip steeply upstream so that the 
lower part of this section is covered. The lower and middle 
portions show the lower part of the section. All except the lowest 
part of the following section was measured near the middle of the 
bend and the lowest portion farther north. 
SECTION ABOVE MILAN RIVER BRIDGE 
No. THICKNESS Tene 
3 2 A Ft. In. Ft. In. 
13. Black, bituminous, fissile shale which is slaty 
beforertweathersn): ane ae pa arraeeccn 6 a 18 103 
72: Bluesshal ever tow2eine eayk ee) een een nomernse ae IZ+ 12 103 
TriBlackr shales anthemic sy cesce idee uelicoae Mee. ae 4 12 9 
LOB wersh ale: eevee iat metre cy ae nae auc sh, Bae a I 12 5 
0: Blacksshale sce geen mice rete an aucune pairs tke es 9 12 4 
8. Blue, argillaceous shale containing disk- 
shapediconcretionsh a. ae eee eee cee I 6 DD 7 
7. Black, bituminous, fissile shale as weathered 
which is hard and slaty when freshly exposed. 
Contains large numbers of spherical, calcareous 
concretions, an occasional somewhat disk- 
shaped one, and small marcasite concretions. 
The spherical concretions range in size from 6 
in. to 3 ft. 6 in. vertical measurement and from 
9 in. to 4 ft. horizontal. They show beauti- 
fully the arching of the shale above the concre- 
tion and its depression below, indicating their 
aggregation after the formation of the shale. 
Stems of probably Pseudobornia tnornata 
(Dawson) White were found at 3 ft. 1 in. and 4 
ft. 3 in. below the top of this zone, which is 
believed to be the one in which Dr. Kindle 
found the long fragment of a trunk of the above 
species. Zone varies in thickness from 7 ft. 3 
Unit! 8 LEey Opn ree eee teresa se raya en ere even aman Sak ose. IO 
6: Blue to olive; gritty shale, 25 to)3 m.. 22.2.2. 3 2 I 
5. Black shale: 202i aire ets Ertan eens 23 I ie) 
Zeblueishales2> stonspin eerie eee eee Bee 3 I 73 
3. Black shale ease cure nen renga Pte eae eee 35 I 43 
22 Blue shales it oa nine yr eae reer eee Yer it I 
tT. Blackishale tomiver levelaer see eee ee Be II II 
t American Journal Science, 4th ser., XXXIV, p. 200. 
