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(2497) 100.0%,

Location: Olancha, California
Ships to: US,
Item: 254244927952

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If making more than one purchase, please read the note following the red text below! Teaching hand specimen of Lower Cambrian hard green shale from the Harkless Formation, White Mountains, California This shale is from the Lower Cambrian Harkless Formation in the White Mountains of California. These specimens are a fairly hard shale, so they will not crumble during student examination as will more fissile shales. Fissile refers to the behavior of shales that weather out as a pile of loose platy flakes. This particular shale exhibits platy parting – it looks like a shale in the outcrop – though it has been slightly metamorphosed. Students should know the basic sedimentary rocks in order of increasing grain size, from mudstone and shale, siltstone, sandstone to conglomerate and coquina. Shales differ from mudstones in that they are more compressed, form flat plates, and are less likely to disappear in a poof of dust when dropped by a student. This shale is fairly hard and should stand up to student examinations. Some shales closely resemble slate, metamorphosed from shale. To distinguish a shale from a slate, the test is to lick it. The shale will smell muddy. The slate won’t. Since this shale varies in hardness, some specimens will smell only faintly muddy when wet. When students identify this shale, I would ask students for the reason for their identification. If they called this a shale because it smells muddy when wet, or if they called it a slate because it does not smell muddy, I would accept either answer. The field photo shows the shale outcrop, where it has been tilted almost vertical. Select a specimen:You can select a specimen by telling us what is in front of it – a black mechanical pencil, a silver and black 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: By first class mail unless combined with other purchases. 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!

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