154 NEW YORK STATE MUSEUM 
Near Cuba® and at Wellsville® this zone contains thin bands of red 
iron ore suggestive of its “ Catskill ” affinities.® . 
The highly fossiliferous “Chemung” beds®* of Erie county, 
Pennsylvania, there carrying Leiorhynchus newberryi,™ 
cross the southern half of Chautauqua county in a broad belt and 
with increasing thickness. They succeed the Volusia shale in the 
Chautauqua gulf section west of Mayville,®*° and on Chautauqua 
lake they include some shales of a distinctly reddish or chocolate 
color. From the exceptional exposure in the shale-brick quarries at 
Dexterville®® (Jamestown) on the Chadakoin river the name 
Chadakoin beds is proposed for this division. These beds pass 
southward and eastward into the upper “ Chemung” of the Warren 
folio®’ and Olean region,®* characterized by such chocolate shales. 
In the Elmira area®® they must lie wholly above the true Chemung, 
in the “ Catskill,” there also distinctly chocolate®® rather than red. 
The “ quarry sandstone ’’® has been recognized as the base of these 
beds westward as far as northwest of Little Valley toward New 
Albion, but much work remains to be done on these strata. 
This completes the list of elements assigned for investigation, but 
the problem impels some consideration of the superjacent terranes, 
once called Chemung, now assigned to the Bradford group.” 
The upper limit of the Chadakoin formation is presumably at 
base of the Panama conglomerate,” or of the equivalent LeBoeuf 
sandstone’? of Pennsylvania. Some uncertainty still prevails as to 
the true correlative of the Panama in the Warren and Olean sec- 
tions.“* The latest opinion’ seems to be that the Panama lies at or 
near the horizon of the Wolf Creek conglomerate™ which (or in its 
° U.S. Geol. Surv. Bul. 41, p. 67, 69. N. Y. State Mus. Bul. 60, p. 970-71. 
“(Geol GF IN, 4, Ada IDs, io. aso, W.S, Geol, Stray, iBall, an, p. 72, 
* Compare Geol. of N. Y., 4th Dist., p. 280 et ante. 
= Pa. 2d G.S) Rept O4) p. 117=18. 
“Ibid. p. 208. 
“aGeol. ot N.Y, 4th Dist, p. 238) 250) 404. 
“Ibid. p. 250, 261, 404. 
TJ. S. Geol. Surv. Folio 172, B, inter, (), 
eo = State Mus. Bul. 60, p. fee 71, 990-93. U.S. Geol. Surv. Bul.. 41 
Dp. 
© TU, S Geol. Surv. Folio 160, p. 10 (field ed., p. 82). 
CINE Yeustate: ViarserB nly Oomp soo mMOoo: 
ead GioulNepytelll lic Np mens tatenVinsemtdlcinlkemnom 2dmeds perc, 
MGeolwoieNe Yo 4th Dist) py 200-Ol 4054 bad Grsuelvepatelelslemonesy, 
* Pa. 2d G.S. Rep’t O4, p. 104-6, 112-13. 
“Ibid. and 'N. Y. State Mus. Bul. 60, p. 0987. 
1, Ss Goole Sitny, Oe) 1/2, 0,4, IN Wo Stahwe IMitis., Ielclloke, ie) (@al @al,))., 
p. 88, 
106 Sp GEol, Stiaw, IBwG “ars ip, SO, IN, Ws Staue Mitts, Iswill, ©, Ds, O71. 
