DELAWARE COUNTY. 285 
SECTION At DELAWARE, CoverRING THE Lower Part or THY Huron SHALE AND THE 
WHOLE OF THE OLENTANGY SHALE. 
INOWelerees lack claten (euunomysinavle)icsnstecwcce cs cesetseesceecescr ces ese 30 it. 
‘<2. Blue shale, without fossils, in thin beds or massive... 8 “ 
See CEM IS TE MIMMNESLOMC imenatecnc. ates ces asiontesaaiveseisdenaciseaascevaase see 4 in. 
ee ene Sle CMMICMMIN ORM Astetccarcactis cecisseieedullsceniscaieeecslesaceeerceseress (ody) «0 \AgRE 
SL JBUIS IWAN KOIDE 5006 eado50 Good ASS here rie BAO Bcre eR Cae ual weet 33) 
Ces OeeamS nen evil om NOsn a etteesan seacsate geass ce seetsnsssbac cessesses soocee 5) 
«© 7. Alternations of blue shale and black slate............... Ase 
ee See Toms inal CwmNceiINON Lienserseeslosescaecctehscledess eoesceeas cberse 4 
‘“¢ 9, Shale, with concretions of blue re that part 
under the weather conchoidally like massive shale. 
These hardened calcareous masses are not regularly 
disposed with respect to each other, but fill most 
of the interval of six feet. They are six to eight 
inches thick, and two to three feet wide horizon- 
Callie aR eN ee eee eitecs se c'ece due secene sec codictcgs stecseuse Orin 
“ 10: Shale ? (sloping talus), not well exposed...........:...... 10 
“11. Bituminous, nearly unfossiliferous, limestone, of a 
black or purplish-black color, hard and crysta line. 
This black limestone shows a few indistinct bi- 
valves. One, which is large and coarse, appears to 
be Avicula pecteniformis, Hall; seen............ ....000 SM 
Sl OnmnlintervalmrOCKiMOt SECMuccissct.civocs reese eseuieceselcancsacceioesess One 
*« 13. Section at Little’s quarry, in the blue limestone (see 
page 96). The upper portions of this are quite 
Cheriyeandapy rititerousy m Lt may Dey. avacdcssoucoemians 2s 
ING eames ene Meaaia tt Sh hace ht Minievi ectemcuccinatsa eset LOD ees 
Above Delaware the black slate and the Olentangy shale are frequently 
seen in the left bank of the river. The strike of the’slate runs a little 
east of the river at the city, passing through and forming the bluff on 
which Hast Delaware is situated. The concretions of black limestone are 
from three inches to three and four feet in diameter, and sometimes 
much larger. Of these Dr. J.S. Newberry says, in the Report of Progress 
Ore Ike), 70, UG) 
“Much of the doubt which has hung around the age of the Huron shale has been 
due to the fact that it has been confounded with the Cleveland shale, which lies 
several hundred feet above it, and that the fossils (without which, as we have said, 
it is generally impossible to accurately determine the age of any of the sedimentary 
rocks) had not been found. Yet, with diligent search, we have now discovered not 
only fossils sufficient to identify this formation with the Portage of New York, but 
the acute eye of Mr. Hertzer has detected, in certain calcareous concretions which 
* No. 9 here appears the same as No. 6 near the base of the section at Cole’s, in 
Troy township. 
