336 CHARLES S. PROSSER 
SECTION ON Huron RIVER AT STANDARDSBURG—Continued 
No. PEGE Tarennnse 
Ft. In. Ft. In. 
7 Blue ishalencutaen grace ire ee a ucts = 10g 2 Eye 
6sBlack ishallel soir si Sate es eee ancy oeneneg ones He oa I 5 
6! Ble Sale: Wey ata ils ae cade Mea erty sear ae he} I 3% 
Avy lacks shale any eins ae vans 5) eet eeanea ewer oh at. We 
gu MBluensbale fies tertih alle, oan oes es aay USER qi Coat Uae ee 
2) iBilackyslalen Ona dinate patna Senet eva eaets se I Aa 4 
ie 
iBlweishaletomivierlevielye see eee sree se 3 ih 3 
Fic. 4.—Large, spherical concretion in Huron shale on bank of Huron River at 
Standardsburg. 
Zone No. 12 of the above section evidently corresponds to the 
lower half of zone No. 2 in the quarry at the three corners to the 
north of Standardsburg. The spherical concretions in the upper 
black shale at this locality are the largest that the writer has seen 
in northern Ohio. The black shales show very clearly that they 
have been moved from their original position by the formation of 
the concretions, so that the shales are arched above the concretions 
and correspondingly pushed down beneath them. 
A few rods above the section just described, Slate Run enters 
Huron River from the southwest and near its mouth the south- 
