Page:Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata (IA reportongeologyo00dinv).pdf/71

No. IV.
2700′ $\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \ \end{matrix}}\right.}$ Medina white sandstone IVc. $\scriptstyle {\left.{\begin{matrix}\ \\\\\ \\\ \\\ \ \end{matrix}}\right\}\,}$ 820′

Reed’s Gap.

Medina red sandstone and shale IV b. 1280′

Jack’s Mt.

Oneida gray SS. and Congl. IVa 622′ No. III.
2300′ $\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \ \end{matrix}}\right.}$ Hudson river slate IIIb $\scriptstyle {\left.{\begin{matrix}\ \\\\\ \\\ \ \end{matrix}}\right\}\,}$ 937′

Reed’s Gap.

Utica black slate IIIa 1367′

Kishicoquillis cr.

No.II
300′± $\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$ Trenton limestone, Part of No. II, about 300′ in Kishicoquillis valley, 150′ in Black Log valley.

The above scale represents all the rocks found in the two western counties. There is very little of No. VIII in Mifflin county, except towards the east side along the Union county line, and very little of Nos. II and III in Juniata except in the Black Log valley; so that no one section will fit all parts of this district.

 

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B. General section in Union and Snyder. No. IX
3500′± Catskill shale and sandstone. $\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$ Not represented in Union; partly in Snyder, including 1000′ of Transition beds IX–VIII. No. VIII
5300′ $\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \ \end{matrix}}\right.}$ Chemung, $\scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}$ 2500′ Measurements along N. C. R. R. opposite Selinsgrove.

At Georgetown the same rocks are only 4000′ thick, owing to thinning of Hamilton and Marcellus. Only Marcellus in Union county.

Portage, Genessee, 300′ Hamilton, 2000′ Marcellus, 500′ No. VII
150′ $\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$ Oriskany sandstone, 50′ The sandstone varies from 20′–60′; the shale from 75′-125′ Oriskany (Stormville) shale 100′ No. VI
250′-350′ $\scriptstyle {\left\{{\begin{matrix}\ \end{matrix}}\right.}$ Lower Helderberg or Lewistown limestone $\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$ An upper limestone-shale series 120′-150′ fossiliferous.

A middle bastard limestone and shale series 25′-75′

A lower limestone series 100′–125′ pure limestone.

No. V
2000′–2300′ $\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$ Upper Salina Vc′. 700′ marls and lime shales. Lower Salina, (Bloomsburg) red shale Vc. 400′, red sandy shale. Clinton, Va. 900 to 1200′. No. IV
2400′± $\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$ Medina white sandstone IVc Nowhere well exposed for measurement in Union and Snyder. Medina red sandstone IVb Oneida gray SS. and Congl. IVa No. III
300′± Hudson river slate, $\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$ Only partially exposed in secluded mountain valleys of Buffalo mountain range; Jack’s and Shade mountains.