Description: If making multiple purchases, please follow the instructions after the red text below. Caliche formed in uplifted Pleistocene lake beds, uncovered and partly dissolved - hand/display specimen Caliche underlies desert soils in a large part of the Western U.S. and in other arid areas. It is composed of calcium carbonate and can be tens of feet thick. An ideal caliche profile would have a hardpan at the surface progressing downward into a platy or laminar layer which overlies a nodular zone, and then intercepts the bedrock. Since a caliche takes tens to hundreds of thousands of years to form, changes in climate disrupt this sequence and an ideal profile is seldom seen.The term caliche is Spanish from the Latin calx for lime. It forms when calcium carbonate is leached from the overlying soil and accumulates some distance below the surface. In parts of the Southwest, caliche posed a real challenge for pioneers when they attempted to dig wells.This caliche formed in the Pleistocene lake beds of former Lake Tecopa in Inyo County, California. Sediment carried by glacial meltwater flowing from the Sierra Nevada at the end of the Ice Age was trapped in the basin of Lake Tecopa and was uncovered when the Amargosa River was unblocked and the lake drained. These sediments, mudstones and siltstones, are relatively soft. The caliche, near the surface, has been exposed by erosion as the area is dissected and is being dissolved by slightly acid rainwater, not a fast process where it seldom rains. Select a specimen: When more than one specimen is shown, you can select a particular specimen by telling us what is in the photo with 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: Priority Mail, which varies by weight and zip code. We can ship for less than eBay will charge, and will refund the overpayment as soon as the box is packed.. 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!
Price: 10.45 USD
Location: Olancha, California
End Time: 2023-10-02T03:26:59.000Z
Shipping Cost: N/A USD
Product Images
Item Specifics
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
