Oct 22, 2025
Lafayette Street, Oolitic, Indiana.
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Lafayette Street, Oolitic, Indiana.
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'Restored aspect of Oolitic vegetation - palm, screw-pine, Araucaria, Cycas, tree-fern etc.' from The past and present life of the globe. Being a sketch in outline of the world’s life-system by David Page, 1861
https://archive.org/details/pastpresentlifeo00pagerich/page/131/mode/1up
OOIDS
One of my favorite sedimentary rock features, ooids. These are small, rounded grains of calcium carbonate, usually 1-2 millimeters in diameter.
Ooids are like coated sand grains. They form in areas where carbonate minerals are readily precipitating, such as warm, tropical oceanic waters. They need a core to start off growth, usually a sand sized grain of sediment or shell fragment. As those grains are tossed around by the waves, typically in a beach or near shore setting, newly formed carbonate minerals grow around the edges. The action of the waves rolls the grains, mostly keeping them from sticking together and allowing them to grow on all sides, forming these nice little spheres.
You’ll sometimes find entire rocks made of these known as oolitic limestones, and in fact there’s even a small town named Oolitic in Indiana (although residents always told me they pronounced the word different, with a long O sound in the name of the town).
-JBB
Image credit: https://flic.kr/p/8EsGdG
Read more: http://www.sandatlas.org/2012/09/oolite/ http://blogs.agu.org/georneys/2011/09/11/geology-word-of-the-week-o-is-for-ooid/ http://www.sepmstrata.org/page.aspx?pageid=105 http://en.wikipedia.org/wiki/Oolitic,_Indiana
Smith Avenue, Oolitic, Indiana.
"Fauna of the Oolitic Period, restored", from Geological Facts; or, the Crust of the Earth, what it is, and what are its uses by the Rev. W. G. Barrett, 1855
https://www.gutenberg.org/cache/epub/72100/pg72100-images.html
After “The Country of the Iguanodon” by John Martin (1837) and maybe “The Age of Reptiles” by George Nibbs (1843)
Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.
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"Vue de la terre pendant la période oolithique superieure" [View of the Earth during the Late Oolitic Period] by Edouard Riou, from La terre avant le déluge [The world before the deluge] by Louis Figuier, 4th edition, 1865
https://archive.org/details/laterreavantled00figu/page/227/mode/1up
The Bahamas from space. This group of 700 atolls and keys in the Atlantic are the tips of great banks poking out above the ocean surface. The bedrock is fossil coral, with lagoonal oolitic limestone derived from the erosion and precipitation of reefs and shells bedded above it. The highest point is only 63 metres above sea level. Only one river exists in the entire archipelago. The photo was snapped from the ISS by NASA astronaut Karen Nyberg. Loz
More Mysterious Ooliths We recently posted an article about ooliths (http://on.fb.me/1yWGLbD), and mentioned that one criteria for formation of ooids is a rather active sedimentary environment, one in which waves or currents can roll them around and around and around, and thus induce them to grow symmetrically to form their spherical shapes. Now imagine another environment. One where sedimentary deposition is sooooo slow that it takes ~5000 years to accumulate a single 5 cm layer. We've written of this environment in the past as well, the most boring environment on Earth, the Abyssal Plains (goo.gl/S8UUDq). Now imagine – wait, this is hard. Another sort of rock in which ooids are found within formations formed from the abyssal ooze. Ummm… how can we form ooids, that apparently require an active sedimentary environment, in the Earth’s most inactive sedimentary environment? Several speculations on how these silicious ooids could form include: -- Could there be an upwelling of current within the abyssal zone that lasts thousands of years? Perhaps near a hydrothermal field near a spreading ridge? -- Could we cheat, and say that these must have been originally formed as limestone ooliths, but these limestone ooliths were then transposed (through plate action such as near a subduction zone) to such great depths that the calcite dissolved and was replaced by silica (that is, chert?) In the field area where this particular sample was found, there are great thick deposits of abbysal ooze (radiolarian cherts) that occur in association with spreading ridge formations. Alas, since this sample is from a tectonic mélange zone, it could also have come from a carbonate that was partially subducted into the depths where calcite dissolves… Oh dear. I suppose there might be some way to solve this mystery, but then it wouldn't be a mystery any more, would it? Please feel free to add your own speculations. Annie R Photo: mine (a scanned image of the rock, actually) from sample found by D. Ghikas within Vourinos Ophiolite sole mélange. Read also to enter the mysterious world of rocks: http://www.sciencedirect.com/science/article/pii/S0037073803001957 https://wwwf.imperial.ac.uk/earthscienceandengineering/rocklibrary/viewglossrecord.php?gID=00000000253 http://www.sandatlas.org/oolite/