{"product_id":"oscillation-ripple-marks-in-siltstone-from-the-moenkopi-formation-teaching-hand-specimen","title":"oscillation ripple marks in siltstone from the Moenkopi Formation - hand\/display specimen","description":"\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"color: #9e0505;\"\u003e\u003cb data-mce-fragment=\"1\"\u003eOscillation ripple marks are caused by the back and forth swash of waves in a shoreline environment. The oscillation forms symmetrical ripples, unlike the asymmetrical ripples formed by a water or wind current. For comparison, the field photo shows asymmetrical ripples forming on the surface of a dune, where sand is pushed in one direction by the wind.\u003cspan data-mce-fragment=\"1\" class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"color: #9e0505;\"\u003e\u003cb data-mce-fragment=\"1\"\u003eThe mudstones, siltstones and sandstones of the early to middle Triassic Moenkopi Formation were deposited nearshore and on the floodplains of a broad coastal plain, in tidal flats and slow-moving rivers along the western edge of North America.\u003cspan data-mce-fragment=\"1\" class=\"Apple-converted-space\"\u003e \u003c\/span\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" style=\"color: #404040;\"\u003e\u003cb data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\" class=\"Apple-converted-space\"\u003eHere's an interesting article on ripples from MIT News, with an embedded video that shows ripples forming and adjusting to differing conditions: \u003cspan style=\"color: #2b00ff;\"\u003e\u003ca style=\"color: #2b00ff;\" href=\"https:\/\/news.mit.edu\/2018\/beach-sand-ripples-ancient-weather-0928\" title=\"how ripples form\"\u003ehttps:\/\/news.mit.edu\/2018\/beach-sand-ripples-ancient-weather-0928\u003c\/a\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cb\u003eSelect a specimen:\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e If there is more than one specimen shown, y\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e\u003cb\u003eou can select a particular specimen by telling us what is in the photo with it, a black and silver pen, a black mechanical pencil (it has an eraser) or one of those plus some number of coins, or you can let us make the selection.\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff2a00;\"\u003e\u003cb\u003eMaking multiple purchases?\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e\u003cb\u003e Click on the \"combine shipping\" button in the shopping cart. We'll send an invoice with combined shipping. A link in that invoice will bring you back to checkout, no hassle.\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cb\u003e\u003cspan class=\"Apple-converted-space\"\u003e\u003cspan style=\"color: #ff2a00;\"\u003eShipping:\u003c\/span\u003e By Priority Mail or USPS Ground Advantage, whichever is cheaper, unless we find a better rate. \u003c\/span\u003eClick \u0026gt; \u003c\/b\u003e\u003c\/span\u003e\u003ca href=\"Ships%20in%20a%20Regional%20Priority%20Mail%20box.%20There%20would%20be%20room%20in%20that%20box%20for%20other%20specimens%20at%20no%20increase%20in%20postage.%20Please%20request%20an%20invoice%20to%20avoid%20overpaying%20shipping,%20by%20clicking%20the%20%22combine%20shipping%22%20button%20in%20the%20cart.%20%20Click%20\u0026gt;%20here%20\u0026lt;%20for%20shipping%20rates.%20Use%20back%20button%20to%20return%20to%20this%20page.\"\u003e\u003cspan style=\"color: #2b00ff;\"\u003e\u003cb\u003ehere\u003c\/b\u003e\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e\u003cb\u003e \u0026lt; for shipping rates. Use back button to return to this page.\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Geological Specimen Supply","offers":[{"title":"Default Title","offer_id":32485637161047,"sku":"","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0960\/7650\/files\/8.jpg?v=1785059103","url":"https:\/\/geologicalspecimensupply.com\/products\/oscillation-ripple-marks-in-siltstone-from-the-moenkopi-formation-teaching-hand-specimen","provider":"Geological Specimen Supply","version":"1.0","type":"link"}