A generalized cross-section of the Mohawk Valley to the Hudson River is shown in

Question

A generalized cross-section of the Mohawk Valley to the Hudson River is shown in Figure 23.

A generalized cross section of the Mohawk Valley to the Hudson River is show Time Scale provided if needed) Hudon Rver Foncia Schenectody Osh ob Osc GSS Osh Pre Pre FIGURE 23 structural cross section of the Mohawk Valley. New York. Adapted from UsGs, Geologic Atlas of the United States. a) Place all of the geologic units in order according to age, starting with the youngest (oldest) b) If the unit Ess is a fine-grained sandstone and the Pree units are metamorphic gneisses, what kind of surface exists between these two units? Assuming that all of the faulting west of Schenectady occurred at the same time in the cross section, what is the age of that faulting? (circle one) 1. Before Ess c) 2. Before Osh 3. After Otbr 4. After Osc EXERCISE IC: CHESTER VALLEY, PENNSYLVANIA In the Philadelphia area, the Chester Valley contains a series of rock units that are shown diagrammatically in Figure 24. (Use the Geologic Time Scale provided if needed) CHESTER VALLEY MDia base Dike-245 ± 5 my EI , Newark Red Beds-Triassic scisschickoopharte ondgrnet EHConestoga lfrnestone/matie Cambro-Ordoviclan Selers Quartzite-Cambrian Gneiss Precambrian schist- Ordovician FIGURE 24 Structural cross section of Chester Valley, Pennsylvania. Adapted from USGS, Geologic Aflas of the United States

Explanation / Answer

a. Osc, Osh, Oc, Otbr, Ob, €ss, Pre € b. The surface that exists between sand stone and gneiss is non-conformity. This layer seperates igneous or metamorphic rocks from sedimentary rocks. c. After Osc. Reason: All the other layers are cut by the fault and present on both sides of the fault.

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