Capitol Reef National Park

But you’ll notice my finger in the picture in the lower left. The old ones have to be on the bottom because they’ve been cut. They’ve been whomped off on the top by the wind that put the next layer down. And there’s a picture over here that we’ve got on the left. And if you follow one of these layers, start down at the green place down at the bottom, and then follow that layer around, and whoop, it bends.

There were crocodiles almost to the North Pole, and palm trees in Wyoming, and all sorts of things. And so for that, we have to go back and look at how rapidly has nature done things over deep time. This week, we feature one GeoMation and three GeoClips. The GeoMation focuses on “detective work”—the kind employed by geologists to trace and identify the geologic histories of the features and structures they study.

This is too long to be accounted for by changes in climate resulting in periods of glaciation. These long terms rises in sea level are probably related to an increase in the rate of sea floor spreading. Rapid sea floor spreading results in an enlargement of the mid oceanic ridge.

Rock more metamorphosed than phyllite, to the point that mica grains are visible. Planer feature where two blocks of bedrock move past each other via earthquakes. A rock layer that has been bent in a ductile way instead of breaking . A type of stratigraphic correlation which is based on similar ages.

Going back in time before the Phanerozoic are the Proterozoic , the Archean or Archeozoic (beginning life; different people prefer Archean or Archeozoic), and the Hadean (like Hades; hellish). You might think of the Nile River flooding across its vast delta, its vast flood plain and then the desert of the Sahara blowing in over the top. If you look carefully in many of these rocks, especially some just a little farther north of this, you will find fish fossils.

Sediment moisture must have played a key role in the production and preservation of the trace fossils, indicating that moisture was important for supporting such complex ecosystems. Extended wet climatic intervals must have persisted intermittently between arid intervals. Flooding surfaces may also exhibit doan cha oc small scale erosion, usually of a meter or less. Flooding surfaces may be mantled by a transgressive lag composed of shells, mud rip-ups, or calcareous nodules; such lags are usually thin, less than a meter thick. Flooding surfaces may display evidence of firmgrounds, such as Glossifungites ichnofacies.

Up here above where I am, if you take your rock hammer and you hit a sedimentary rock, it goes, boom! And all this is is loose sand that’s been glued together by hard water deposits. And so you need to know, has it been hot enough to cook those rocks? And so to figure that out, you need to know something about how deeply they’ve been buried, how long they were down there, how long it took them to come back up, what is their path through time, temperature, space.

The red hematite that gives red bed sandstones their color is likely formed during eogenesis. Some biochemical processes, like the activity of bacteria, can affect minerals in a rock and are therefore seen as part of diagenesis. Groundwater circulating through sediments will dissolve minerals in some places and precipitate them in others, in response to subtle changes in temperature, pressure, or chemistry. We saw that there is dissolved rock in Spring Creek water, and in all other waters. If you have “hard” water, of the sort that causes people to buy water softeners, that means the water has a lot of dissolved rock and especially dissolved limestone.

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