At this outcrop, there is an anticline developed within the Salona-Coburn Format

Question

At this outcrop, there is an anticline developed within the Salona-Coburn Formation. At the northern end of the outcrop si the contact with the Antes shale that marks the end of carbonate depostition. You will be expected to answer the following series of questions.

Please answering the following: (Please answer all parts precisely and asap!!!)

- What is the significance of the contact with the Antes Shale? Would you expect this contact to be older or younger at a location 40 kilometers to the southeast? Why?

Explanation / Answer

The Antes Shale of central Pennsylvania is part of a diachronous but continuous belt that overlies shelf and slope carbonates and is present from the central Appalachians to the Maritime Provinces. The Antes Shale of the Utica Group record distal deposits in an under-filled foreland basin. Through much of the Valley and Ridge of Pennsylvania, the Antes overlies Trenton Group, the Salona and Coburn formations. Although much thicker, the Salona is correlative with the Watertown to Napanee formations of New York State, and the Coburn is equivalent to the Kings Falls and perhaps some or all of the Sugar River formations. A disconformity between the Coburn and Antes formations is recorded by a mineralized limestone and a lengthy biostratigraphic gap.

A zone of south-east verging fourth-order folds within the coburn and salona limestones embedded in a 2 km thick tabular, stratigraphic section extending for 40 kms. The detachment zone is the only departure from a dip. No cleavage or small scale folds will be visible in the Antes Shale. Such detachments look like at the north-eastern end. So, I would expect the contact with the Antes Shale at a location 40kms to the Southeast is older.

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