Rainbow Rock
Uploaded: March 19, 2010 21:29:46
Rainbow Rock is considered geologically significant and is located at the southern end of the Samuel Boardman State Park on the southern Oregon coast. It displays radiolarian and diatom compaction in chert and sedimentary rock. Radiolarians are amoeba-like protozoa whose mineral skeletal remains cover large portions of the sea floor, mostly near the equator. Diatoms are a form of algae encased with a unique form of silica. They both date as far back as the Cambrian period (500 million years ago). If you look closely you can see how the rocks layers have several small anticlines (upward curved folds) and synclines (downward u-shaped folds). There may also be evidence of faulting within the rock, and probably also caused the rock to be exposed as it is today. It is quite unusual to have so many different geological features within a single rock.
Exif: F Number: 10, ExposureTime: 100/31999 seconds, ISO: 200, FocalLength: 80.00 mm, Model: NIKON D700
Ann H. Belus
March 19, 2010
Kathy Salerni
March 19, 2010
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