Right of center is a vertical white band, which is a granitic intrusion that cut through the Vishnu rocks and was folded with them. Follow it upwards towards the Tapeats sandstone, where it just ends.
This is a "cross-cutting relationship", which is nearly proof that the "cross-cut" rock unit is older. For an unannotated image, click here. Back to Workshop Index.
Back to "The Great Desert". The Great Unconformity is important for three reasons: it represents a long span of time -- to million years in the Grand Canyon; it is found nearly everywhere across the globe; and it divides rocks with familiar fossils from those with no fossils or only fossil bacteria.
View from Ooh-ah point, west into Granite Gorge. The Great Unconformity the red line is the surface between the Tapeats sandstone Cambrian age and the metamorphic rocks of Granite Gorge. These are Karl's beat-up "happy" rocks. About 5, years, N Already member? Sign In.
Layers above and below line are parallel LAB 11 - Geologic Time Question 1 What type of unconformity is shown by the red line in this image? Answers: The photosynthetic process of plants produces C as a by product. Question 5 What is the half-life of C and what is its daughter element? Answers: About 1 hour, B About 1. Option 1 Low Cost Option Download this past answer in few clicks 2.
View Answer. Sitejabber 5. A nonconformity is obvious, because crystalline rocks occur below the contact. Disconformities , however, can be more of a challenge to recognize. If strata in the sequence are fossiliferous, and you can recognize the fossil species and know their age, then you can recognize a gap in the fossil succession.
Commonly, an unconformity may be marked by a surface of erosion, as indicated by scour features, or by a paleosol, which is a soil horizon that formed from weathering prior to deposition of the overlying sequence. Some unconformities are marked by the occurrence of a basal conglomerate, which contains clasts of the rocks under the unconformity.
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