Description: If you are making more than one purchase, please read the note following the red text below. Tan silty limestone from the Jurassic Carmel Formation of Utah - hand/display specimen This tan silty limestone is interbedded with shales in the Middle Jurassic Carmel Formation in southwestern Utah. Limestones are primarily biogenic in origin, being composed of the protective shells of small organisms that extract calcium carbonate from seawater to build their shells. There is a constant rain of microscopic shells and other calcareous parts onto the sea floor, which when accumulated and consolidated becomes limestone. Chalk is a form of limestone composed entirely of the minute calcium carbonate shells of coccolthophores, a unicellular phytoplankton. Coquina is a form composed of shells and shell fragments, only partly consolidated. When a limestone contains clay, it grades towards shale and is called an argillaceous limestone. Because the composition of limestone is calcium carbonate, a limestone will strongly effervesce with dilute hydrochloric acid. Dolomite, which can have the same appearance as a limestone, is calcium-magnesium-carbonate, and effervesces only reluctantly. Often a dolomite will effervesce with acid only where powdered by a few taps of a geologist's hammer, a useful field test. This limestone is a good contrast with the more typical gray limestones. Students should understand that limestone is not always gray, and that it can vary in color. In the field photos, Carmel Formation limestone forms the cliff. The slope is limey shale from the Carmel Formation. Tyrannosaurus Cat blends in near the base of the blocky limestone for a "Where's Waldo" challenge. See him? Hint: onnthe first limeestone block. Cliff-forming limestone and slope-forming shale are typical arid area landforms. Select a specimen: When more than one specimen is shown, you can select a particular specimen by telling us what is in front of it - a black mechanical pencil, a silver and black pen, a silver and blue pen, or one of those plus some number of coins, or you can let us make the selection. Making multiple purchases?Just add items to your cart. When finished shopping, click on “request total” at upper right in the Shopping Cart window. Do not proceed to checkout. We will send an eBay invoice with the correct combined shipping. The combined shipping will often be less than eBay shows. Please wait for that invoice before paying. There is no obligation to purchase. You can decide after seeing what shipping will cost.Shipping: USPS Ground Advantage International customers: We sell and ship internationally. If eBay’s page does not let you enter your country name to determine the shipping cost for something you are interested in, please contact us. We can tell you what the shipping would cost and how to make the purchase. You can then decide if you wish to complete the transaction. Use the Contact Seller link in the Seller Information box on the right side of this page. Pay securely with your debit or credit card through PayPal! You do not need a Pay Pal account to do this. Yes, we do combine shipping! Click on "Request total" in the shopping cart for a no-obligation invoice to see the total with shipping.
Price: 10.45 USD
Location: Olancha, California
End Time: 2024-11-23T07:36:23.000Z
Shipping Cost: N/A USD
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Return shipping will be paid by: Seller
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
