K., Oceans (Prentice-Hall, New Jersey, 1968).īeck, K. This section illustrates thin sections of the. I., Physicochemical Investigations of Sedimentary Iron and Manganese Ores and Associated Rocks (Daniel Davey, New York, 1964). Oolite, a light gray rock composed of siliceous oolites cemented in compact silica, is formed in the sea. Extensive beds of ferriferous oolite thicker than 1 m have formed repeatedly throughout the history of the Earth, even within the last 5 Myr (ref. Some Recent ferriferous spherules are concentrically layered 5 but, unlike the ooids in iron ores, they contain clay minerals other than ferrous septechlorite, and occur collectively only as moderately iron-rich sediments, no thicker than a few tens of centimetres. The internal structures of well preserved ferriferous ooids closely resemble those of Recent calcareous ooids. The second is the occurrence of oolite texture in unmetamorphosed deposits which are not closely associated with volcanic rock or shales bearing pyroclastic material. The first is the occurrence of mudrocks, or their metamorphosed equivalents, overlying individual ore beds within a few metres, with the ore beds themselves covered by non chemical sedimentary rock and not eroded. Ironstones and iron formations 3, here termed non-cherty and cherty iron ores, have, however, two consistent characteristics which suggest that their origins were fundamentally similar and involved processes which are still operative at present 4. Also, if the weather is a little warmer, be sure to be vigilant of the pads of your dog's paws that can overheat easily in the sand.MANY non-uniformitarian 1 or quantitatively improbable 2 hypotheses have been offered to explain the origins of extensive sedimentary rocks rich in iron. The trail is off leash dog friendly, but there are no trash cans so please be sure to bag up and pack out the little land mines. Spring (through May) and fall are the best times to visit as summer is scorching hot and the desert becomes riddled with rattle snakes. Consider also walking along the oolite structures to see them all up close. In the British Isles oolitic limestone is characteristic of the middle and upper Jurassic, which was formerly termed the Oolite on this account. For a view of the Owyhees, head up to the tallest dune from the oolite formations. oolite oolite (lt, ), rock composed of small concretions, usually of calcium carbonate, containing a nucleus and clearly defined concentric shells. Once you reach the top of the cliff, you'll be able to see along the stretch of rock formations and from there you can begin exploring. This uphill is all sand (oolites "granules" actually), so take your time. The hike from the parking area to the oolites is only a half mile, and about the last 1/8th of that portion is a steep uphill grade. These structures stretch on for as far as you can see, and only a minute portion are included in the article photography.Īccess to the trailhead is very easy any vehicle, even a Prius, can reach it as the road is chip-and-seal the entire route. Situated 200 feet up the interpretive trail stand the oolite rock structures. The two to three car parking area is situated at about and elevation of 3000 feet. Just north of the Owyhee mountain range, these little known oolite rocks have become stunning geological formations free for all to poke around and explore in otherwise flat surroundings. Oolite (egg stone) is a sedimentary rock formed from ooids, spherical grains composed of concentric layers - per Wikipedia.
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