{"product_id":"shark-tooth-fossils","title":"Shark Tooth Fossils","description":"\u003cp\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSharks have inhabited the oceans for approximately 450 million years, making them older than the dinosaurs. These miniature teeth are the only remains of sharks that lived millions of years ago. Incredibly, sharks have survived four of the five major extinction events in the history of the Earth.\u003c\/p\u003e\n\u003cp\u003eThe teeth come from a wide variety of species and range in size. Some displays come with 4 smaller teeth, and some come with 2 larger teeth, but everyone will be different since no 2 Shark teeth are the same. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSignificance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"321\" data-start=\"0\"\u003eShark teeth from about \u003cstrong data-end=\"51\" data-start=\"23\"\u003e110–40 million years ago\u003c\/strong\u003e are significant because they provide some of the best evidence we have for understanding ancient shark evolution, marine ecosystems, and major environmental changes during the late \u003cstrong data-end=\"274\" data-start=\"233\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eCretaceous Period\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e and \u003cstrong data-end=\"320\" data-start=\"279\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003ePaleogene Period\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch4 data-end=\"403\" data-start=\"358\"\u003e1. Sharks rarely fossilize, but teeth do\u003c\/h4\u003e\n\u003cp data-end=\"703\" data-start=\"404\"\u003eA shark's skeleton is made mostly of cartilage, which decomposes easily. Teeth, however, are highly mineralized and fossilize readily. Since sharks continuously shed teeth throughout their lives, fossil deposits can contain thousands of teeth, giving scientists abundant evidence of ancient species.\u003c\/p\u003e\n\u003ch4 data-end=\"742\" data-start=\"705\"\u003e2. They document shark evolution\u003c\/h4\u003e\n\u003cp data-end=\"852\" data-start=\"743\"\u003eTeeth from 110–40 million years ago capture major evolutionary transitions, including the diversification of:\u003c\/p\u003e\n\u003cul data-end=\"1059\" data-start=\"853\"\u003e\n\u003cli data-end=\"926\" data-start=\"853\" data-section-id=\"1ulozzn\"\u003eEarly mackerel sharks (order \u003cstrong data-end=\"925\" data-start=\"884\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eLamniformes\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e)\u003c\/li\u003e\n\u003cli data-end=\"986\" data-start=\"927\" data-section-id=\"kcgudo\"\u003eAncestors of modern tiger, requiem, and hammerhead sharks\u003c\/li\u003e\n\u003cli data-end=\"1059\" data-start=\"987\" data-section-id=\"1eso7nr\"\u003eLarge predatory sharks that occupied top positions in marine food webs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1171\" data-start=\"1061\"\u003eResearchers can identify species and evolutionary relationships by studying tooth shape, serrations, and size.\u003c\/p\u003e\n\u003ch4 data-end=\"1218\" data-start=\"1173\"\u003e3. They reveal ancient marine ecosystems\u003c\/h4\u003e\n\u003cp data-end=\"1267\" data-start=\"1219\"\u003eDifferent tooth shapes indicate different diets:\u003c\/p\u003e\n\u003cul data-end=\"1467\" data-start=\"1268\"\u003e\n\u003cli data-end=\"1316\" data-start=\"1268\" data-section-id=\"j7scea\"\u003eLong, narrow teeth suggest fish-eating sharks.\u003c\/li\u003e\n\u003cli data-end=\"1384\" data-start=\"1317\" data-section-id=\"1hdpns5\"\u003eBroad, serrated teeth indicate predators that fed on larger prey.\u003c\/li\u003e\n\u003cli data-end=\"1467\" data-start=\"1385\" data-section-id=\"1xjtti9\"\u003eCrushing teeth suggest sharks that ate shellfish and other hard-shelled animals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1593\" data-start=\"1469\"\u003eBy examining fossil shark teeth, scientists reconstruct food webs and determine what kinds of animals lived in ancient seas.\u003c\/p\u003e\n\u003ch4 data-end=\"1651\" data-start=\"1595\"\u003e4. They record major extinction and recovery events\u003c\/h4\u003e\n\u003cp data-end=\"1800\" data-start=\"1652\"\u003eThe interval includes the \u003cstrong data-end=\"1719\" data-start=\"1678\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eCretaceous–Paleogene extinction event\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e, which eliminated non-avian dinosaurs and many marine species. Shark teeth show:\u003c\/p\u003e\n\u003cul data-end=\"1948\" data-start=\"1801\"\u003e\n\u003cli data-end=\"1846\" data-start=\"1801\" data-section-id=\"1tscdc0\"\u003eWhich shark groups survived the extinction.\u003c\/li\u003e\n\u003cli data-end=\"1891\" data-start=\"1847\" data-section-id=\"10ykwcq\"\u003eHow marine ecosystems recovered afterward.\u003c\/li\u003e\n\u003cli data-end=\"1948\" data-start=\"1892\" data-section-id=\"wf8b7z\"\u003eChanges in shark diversity before and after the event.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-end=\"1996\" data-start=\"1950\"\u003e5. They help reconstruct ancient climates\u003c\/h4\u003e\n\u003cp data-end=\"2069\" data-start=\"1997\"\u003eThe chemical composition of fossil teeth can preserve information about:\u003c\/p\u003e\n\u003cul data-end=\"2122\" data-start=\"2070\"\u003e\n\u003cli data-end=\"2090\" data-start=\"2070\" data-section-id=\"2bqi7l\"\u003eOcean temperatures\u003c\/li\u003e\n\u003cli data-end=\"2101\" data-start=\"2091\" data-section-id=\"53y039\"\u003eSalinity\u003c\/li\u003e\n\u003cli data-end=\"2122\" data-start=\"2102\" data-section-id=\"amurgf\"\u003eMigration patterns\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2217\" data-start=\"2124\"\u003eScientists analyze isotopes in fossil teeth to learn how ancient oceans changed through time.\u003c\/p\u003e\n\u003ch3 data-end=\"2258\" data-start=\"2219\" data-section-id=\"17h9pub\"\u003eNotable sharks from this time range\u003c\/h3\u003e\n\u003cp data-end=\"2353\" data-start=\"2259\"\u003eSome important sharks known from teeth dating within or near 110–40 million years ago include:\u003c\/p\u003e\n\u003cul data-end=\"2699\" data-start=\"2354\"\u003e\n\u003cli data-end=\"2443\" data-start=\"2354\" data-section-id=\"1kgn140\"\u003e\n\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eCretoxyrhina\u003c\/span\u003e\u003c\/span\u003e — a large predatory shark of the Late Cretaceous.\u003c\/li\u003e\n\u003cli data-end=\"2545\" data-start=\"2444\" data-section-id=\"zlb73w\"\u003e\n\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eSqualicorax\u003c\/span\u003e\u003c\/span\u003e — known for serrated teeth and scavenging\/predatory behavior.\u003c\/li\u003e\n\u003cli data-end=\"2699\" data-start=\"2546\" data-section-id=\"1cj0i4y\"\u003e\n\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eOtodus obliquus\u003c\/span\u003e\u003c\/span\u003e — an early giant shark that lived after the dinosaur extinction and is related to later giant megatoothed sharks.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Engineered Labs","offers":[{"title":"Default Title","offer_id":43431943274585,"sku":"AC-104010-S1","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/9096\/0473\/files\/Shark-Teeth-Front-Facing-Shark-Teeth-In-Front-White-Background.png?v=1781371681","url":"https:\/\/earthlytreasuresgallery.com\/products\/shark-tooth-fossils","provider":"Earthly Treasures Gallery","version":"1.0","type":"link"}