Austin chalk
By ThePhysicist
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The Austin chalk as its name suggests is primarily composed of chalk beds with interspersed marls. Here you can see the transition from chalk to marl (light towards the top, grey towards the bottom). I at first hoped this was the Eagle Ford contact horizon (which is a shale with cool shark teeth), but alas not.
Photo Information
- Taken with Apple iPhone SE (2nd generation)
- Focal Length 4 mm
- Exposure Time 1/121
- f Aperture f/1.8
- ISO Speed 40
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