starbiter wrote:Sparky asked about burnt limestone earlier. The sample pictured below is from a small mountain West of Las Vegas. The mountain is composed of limestone and dolomite. The sample below fizzed when exposed to acid so it is limestone. Only the surface is brown/black and burnt looking. The entire interior seems grey.
http://maps.google.com/maps?hl=en&ie=UT ... 1&t=p&z=15
MrAmsterdam wrote:Electrical Properties of Moist Limestone Samples in the Frequency range of 1Hz - 10.000.000Hz
The principal fault (the Maghlaq fault) ... accounts for the fact that while Filfla is composed of Upper Coralline Limestone, the coast of Malta in the same region is made up of Lower Coralline and Globigerina Limestones.
Regional Tectonics - Filfla Island's geology different to the coast
ancientd wrote:Im in England right now and on the South coast near the channel you have the chalky white cliffs of Dover plopped next to other rocky cliffs of an entirely different rock. Then you have the chalky arms of the north and south DOWNS ( ridges) running inland .
webolife wrote:Hey Sparky,
While I was gone the thread went a completely different direction! I recall one little island [perhaps a couple acres in size?] we kayaked to with probably a dozen or two of these circularish features, in various degrees of wear from stormy wave action. Later while snorkeling I observed numerous roughly cylindrical [diameters from a meter or less to maybe 10 meters] reef structures, especially a half kilometer or so out from shore, where the breakers were. Also a green sea turtle... but no sharks... I vote for reef... weathering and erosion by wave action may have erased signs of reef fossils in some of the Maltese surface material, but I would have to go there to see if they looked the same as Oahu.
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