Chimney Rocks, Geological Area - Hollidaysburg, Pennsylvania, USA
Posted by: Groundspeak Premium Member ted28285
N 40° 25.238 W 078° 23.163
17T E 721763 N 4477726
Quick Description: The Chimney Rocks Formation is located in the Ridge and Valley Province.
Location: Pennsylvania, United States
Date Posted: 12/11/2021 2:44:56 AM
Waymark Code: WM15D1W
Published By: Groundspeak Premium Member Blue J Wenatchee
Views: 1

Long Description:

The Chimney Rocks Geological formation sets to the east of Hollidaysburg Borough in a public park, named Chimney Rocks Park. There are hiking trails that lead from parking to the formation. The rocks gave long been a landmark and point of interest.

Chimney Rocks is an outstanding outcrop of towers of limestone. The rocks are beds of the Tonoloway and Keyser Formations and part of the western flank of Catfish Ridge. The ridge is mainly supported by the Keyser Formation, a limestone that is slightly more resistant than the Tonoloway Formation, and which makes up the base of the ridge. A small vertical fault is the primary cause for the development of the chimneys.

Northeast trending joints, which have enlarged by dissolution of limestone, also have contributed to the isolation of the chimneys. The Keyser Formation is noticeably fossiliferous, including crinoids, corals, brachiopods, bryozoans, and stromatoporoids.

In addition, Chimney Rocks provides a scenic view of Hollidaysburg and its setting in the Ridge and Valley Province.

In the distance, the imposing wall of the Allegheny Front rises to the north. This marks the boundary between the Ridge and Valley and the Appalachian Plateaus physiographic provinces.

"Keyser and Tonoloway Formations, undivided:
In descending order: Keyser Formation--medium-gray, crystalline to nodular, fossiliferous limestone; upper part laminated and mud-cracked; not present east of Harrisburg; passes into lower Coeymans, Rondout, and Decker Formations in the east. Tonoloway Formation--medium-gray, laminated, mud-cracked limestone containing some medium-dark- or olive-gray shale interbeds; lower part passes into Wills Creek Formation east and south; passes into Bossardville and Poxono Island beds in the east.

State: Pennsylvania
Name: Keyser and Tonoloway Formations, undivided
Geologic age: Devonian and Silurian

Waymark is confirmed to be publicly accessible: yes

Parking Coordinates: N 40° 25.112 W 078° 23.240

Access fee (In local currency): .00

Requires a high clearance vehicle to visit.: no

Requires 4x4 vehicle to visit.: no

Public Transport available: no

Website reference: [Web Link]

Visit Instructions:
No specific requirements, just have fun visiting the waymark.
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Recent Visits/Logs:
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r.e.s.t.seekers visited Chimney Rocks, Geological Area - Hollidaysburg, Pennsylvania, USA 12/17/2021 r.e.s.t.seekers visited it