{"product_id":"fossil-fern-crenulopteris-acadica-illinois-1","title":"Fossil Fern | Crenulopteris acadica | Illinois","description":"\u003cp style=\"text-align: center;\"\u003eCrenulopteris acadica\u003cbr\u003ePennsylvanian\u003cbr\u003eCarbondale Formation\u003cbr\u003eCoal City, Illinois\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eSpecimen approx. size: 3.125\" x 0.75\"\u003c\/p\u003e\n\u003cp\u003eMatrix approx. size: 3.125\" x 1.5\"\u003c\/p\u003e\n\u003cp\u003e*Note: the lighter half is much thinner than the darker half.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eCrenulopteris acadica is an extinct seed fern (Pteridosperm) known from the Pennsylvanian (Carboniferous) period, approximately 310–315 million years old.\u003c\/p\u003e\n\u003cp data-end=\"604\" data-start=\"586\"\u003e\u003cstrong\u003eMorphology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"1188\" data-start=\"605\"\u003e\n\u003cli data-end=\"684\" data-start=\"605\"\u003e\n\u003cp data-end=\"684\" data-start=\"607\"\u003eFronds are pinnate to bipinnate, with well-defined, evenly spaced pinnae.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"790\" data-start=\"685\"\u003e\n\u003cp data-end=\"790\" data-start=\"687\"\u003ePinnules are typically rounded to ovate, attached directly to the rachis without a stalk (sessile).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"882\" data-start=\"791\"\u003e\n\u003cp data-end=\"882\" data-start=\"793\"\u003eMargins commonly show the crenulated or scalloped edges that give the genus its name.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1007\" data-start=\"883\"\u003e\n\u003cp data-end=\"1007\" data-start=\"885\"\u003eVenation is open and regularly branched, with a strong midvein and secondary veins arching toward the pinnule margins.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"In Stone Fossils","offers":[{"title":"Default Title","offer_id":49140539359454,"sku":"ILFRN8","price":55.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0466\/5117\/9163\/files\/rn-image_picker_lib_temp_c4f2d473-440b-43a5-82a9-ba4e049bb57e.jpg?v=1792776639","url":"https:\/\/instonefossils.com\/products\/fossil-fern-crenulopteris-acadica-illinois-1","provider":"In Stone Fossils ","version":"1.0","type":"link"}