Description: If making multiple purchases, please read the note following the red text below! Arkose - medium-grained poorly sorted arkosic sandstone from the Lower Eocene Wasatch Formation, Sweetwater County, Wyoming - hand/display specimenWasatch Formation main body An arkosic sandstone is immature, meaning that the grains are not only quartz, but feldspar, granitic rock fragments and often mica. As sediment is transported, the feldspar and micas weather to form clay, with the more resistant quartz becoming the dominant remaining constituent in a pure sandstone. A sandstone is generally described as an arkose when feldspar makes up 25% or more of the sediment grains, though many geologists call any sandstone where feldspar is present an arkose. The brightly reflecting grains in this arkose are mica. The clasts (sediment grains) are are poorly sorted and not well rounded. Small dust grains form a matrix filling the space between the larger grains, and the orange color is typical of many arkoses. A fluvial basin-edge depositional environment of this arkose, and weathering of iron bearing minerals to hematite, account for the crossbedding and orange color of the Wasatch at this locality. The field photo shows the crossbedded nature of the outcrop on Highway 191 south of Rock Springs, Wyoming, where this was collected. 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 or Parcel Select Ground. whichever is cheaper. These vary 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: 2024-11-04T04:27:35.000Z
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
