For each of the following maps, identify the structure or geologic features port

Question

For each of the following maps, identify the structure or geologic features portrayed. Does the map sh Date strata, dike, pluton, unconformity, or some combination? To answer these questions, diagrams presented earlier in the chapter. Remember- think in three dimensions! With a little practice recognize the basic patterns quickly. Note: the geologic periods in the maps bel Ordovician, Silurian, Devonian, Triassic, Jurassic, Cretaceous, and Tertiary. ow a fault, fold, tilited geologists learn to ow in order from oldest to youngest are the you may need to refer to the block Geologic maps. Map A Map B Map C Jrt Db Kg 12 43 Dn Ka Sh 27 10 56 Dn Dt Dn Kb Sw 12 Db Dp Db Jrt Jurassic Tinta Fm. Tb Tertiary basalt Ka Cretaceous Altoona Fm. Cretaceous granite Devonian Alsen Fm. Triassic Jones Sh. Cretaceous Barrell Fm. Dt Devonian Tella Fm. Db Devonian Bouser Fm. Dn Devonian Norfolk Sh Sh Silurian Hallo Fm Devonian Potomoo Ls Db Devonian Becraft Ls. Dn] Devonian Norfolk Sh. Sc Silurian Cligfell Fm. SW Silurian Wala Sh. Si Silurian Jack Fm. Ot Ordovician Trent Fm. (a) Describe the geologic features of Map A. -aged strata are overlain at an unconformity by -aged strata. What type of unconformity is it? ii. The Triassic and Jurassic strata dip in a ii. The Silurian and Devonian strata dip in a direction at a angle angl (continue direction at a

Explanation / Answer

i. Triassic Jones Sh. aged strata are overlain at an unconformity by Jurassic Tinta Fm. aged strata.

Angular Unconformity

ii. The Triassic and Jurassic strata dip in a North East Direction at a 96 degree angle.

iii. The Silurian and Devonian strata dip in a South West Direction at 180 - 270 degree angle.

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