Lot Of Fossil Shark Teeth 45-70 Million Yr Old Plus Identification Poster For Sale
Up for sale is a fun item - it's a lot of approximately 100 fossilizedshark teethfound inthe Phosphate mines of Khouribga, Morocco inNorth Africa. The fossils are between 45- 70 million years old! Included with the fossilized teeth is a beautiful poster that identifies sharktooth fossils that are commonly found in this area. The poster is on heavy duty, 110 pound, acid free paper. So you can look through theshark teeth and identify thedifferent types you have in your box. There will be several different species of teeth in each box, but not every type of tooth represented on the poster will be found in the box. For even more fun, you can bury the teeth in a bucket of sand and let kids search for the teeth and then identify the ones they have found. These are specimen pieces - many are partial, broken teeth but there are complete teeth in there too (see photos for a general idea of the quality/quantity of teeth per box). This is a great activity for teachers, birthday parties, and just something fun to do with your family to get your kids excited about fossils. Additional boxes of approximately 100 shark teeth are available for $6.99 and larger quantities available upon
I am so confident that you'll love this item that I offer a 100% money back guarantee - when you receive the item if you're not happy for any reason, send it back within 14 days and I'll refund your purchase price. THE MONEY BACK GUARANTEE IS NOT AVAILABLE FOR ITEMS THAT HAVE BEEN ALTERED IN ANY WAY BY THE BUYER. We are happy to combine shipping! I'm also happy to hold off on shipping if you want to watch my sales for several weeks and then combine shipping in the same box.
PLEASE NOTE: We appreciate the business of our international customers! We request that international buyers have signature confirmation tracking or insurance on their packages. PLEASE INFORM US when you make a purchase if you would like to add signature confirmation or insurance to your order, and we can let you know what the additional cost would be. Packages may still be shipped internationally without signature confirmation or insurance, but the buyer would assume responsibility if the package was lost or stolen. The buyer is responsible for any customs or duty fees that are charged by their country.
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Mosasaurs Fossil range: Late Cretaceous, 85–65Ma
Tylosaurus specimen nicknamed "Bruce"
†Mosasauridae Gervais, 1853
Mosasaurs (from Latin Mosa meaning the 'Meuse river', and Greek sauros meaning 'lizard') are large extinct marine lizards. The first fossil remains were discovered in a limestone quarry at Maastricht on the Meuse in 1764. Mosasaurs are now considered to be the closest relatives of snakes, due to cladistic analyses that have taken into account similarities in jaw and skull anatomies. Mosasaurs were varanoids closely related to terrestrial monitor lizards. They probably evolved from semi-aquatic squamates known as aigialosaurs, which were more similar in appearance to modern-day monitor lizards, in the Early Cretaceous. During the last 20 million years of the Cretaceous Period (Turonian-Maastrichtian), with the extinction of the ichthyosaurs and pliosaurs, mosasaurs became the dominant marine predators.
5 Evolutionary antecedents
7 In popular culture
9 External links
Plioplatecarpus primaevus skull Oxford University Museum of Natural History.
Mosasaurs breathed air, were powerful swimmers, and were well-adapted to living in the warm, shallow epicontinental seas prevalent during the Late Cretaceous Period. Mosasaurs were so well adapted to this environment that they gave birth to live young, rather than return to the shore to lay eggs, as sea turtles do.
The smallest-known mosasaur was Carinodens belgicus, which was about 3.0 to 3.5 m long and probably lived in shallow waters near shore, cracking mollusks and sea urchins with its bulbous teeth. Larger mosasaurs were more typical: mosasaurs ranged in size up to 17 m. Tylosaurus holds the record for longest mosasaur, at 17.5 m.
Reconstruction of Platecarpus showing crescent-shaped fluke.
Mosasaurs had a body shape similar to that of modern-day monitor lizards (varanids), but were more elongated and streamlined for swimming. Their limb bones were reduced in length and their paddles were formed by webbing between their elongated digit-bones. Their tails were broad, and supplied the locomotive power. This method of locomotion may have been similar to that used by the conger eel or sea snakes today. However, more recent evidence suggests that many advanced mosasaurs had large crescent-shaped flukes on the ends of their tails similar to those of sharks and ichthyosaurs. Rather than snake-like undulatory movement, the body probably remained stiff in these mosasaurs to improve hydrodynamic efficiency through the water while the end of the tail provided strong propulsion. The animal may have lurked and pounced rapidly and powerfully on passing prey, rather than hunting for it.
Skeletal drawings of three types of mosasaur
Mosasaurs had a double-hinged jaw and flexible skull (much like that of a snake), which enabled them to gulp down their prey almost whole, a snakelike habit which helped identify the unmasticated gut contents fossilized within mosasaur skeletons. A skeleton of Tylosaurus proriger from South Dakota included remains of the diving seabird Hesperornis, a marine bony fish, a possible shark and another, smaller mosasaur (Clidastes). Mosasaur bones have also been found with shark teeth embedded in them.
Based on features such as the double row of pterygoid ("flanged") teeth on the palate, the double-hinged jaw, modified/reduced limbs and probable methods of locomotion, many researchers believe that snakes and mosasaurs may have had a common ancestor. This theory was first suggested in 1869, by Edward Drinker Cope, who coined the term "Pythonomorpha" to include them. The idea lay dormant for more than a century, before being revived in the 1990s.
A 43 ft. (13 m) complete fossil specimen of Mosasaur species Tylosaurus proriger (with a human for scale) on display at the Academy of Natural Sciences in Philadelphia.
Despite the relatively high number of mosasaur remains collected worldwide, knowledge of the nature of their skin coverings remains in its early stages. An incredibly small amount of mosasaurid specimens collected from around the world retain fossilized scale imprints; this lack of knowledge is possibly due to the delicate nature of the scales, which nearly eliminates possibility of perservation, in addition to the preservation sediments types and the marine conditions under which the preservation occurred. Until the discovery of several mosasaur specimens along with their remarkably well preserved scale imprints from late Maastrichtian deposits of the Muwaqqar Chalk Marl Formation of Harrana in Jordan, knowledge of the nature of mosasaur integument was mainly based on very few accounts describing early mosasaur fossils dating back to the upper Santonian-lower Campanian such as the famous Tylosaurus specimen (KUVP-1075) from Cove County, Kansas. Material from Jordan has shown that the body of mosasaurs, as well as the membrane between the fingers and toes, was covered with small overlapping diamond-shaped scales resembling those of snakes. Much like modern reptiles, there existed regional variations in the type and size of the scales that covered the mosasaurs. In Harrana specimens, two types of scales were observed on a single specimen, keeled scales covering the upper regions of the body as well as smooth scales covering the lower regions. As ambush predators, lurking and quickly capturing prey using stealth tactics, it is suggested mosasaurs benefited greatly from the non-reflective keeled scales.
More recently, a well preserved fossil of Platecarpus tympaniticus has been found that preserves not only skin impressions, but also internal organs. There are several reddish areas in the fossil that may represent the heart, lungs, and kidneys. The trachea is also preserved along with part of what may be the retina in the eye. The placement of the kidneys is farther forward in the abdomen than it is in monitor lizards, and is more similar to that of cetaceans. As in cetaceans, the bronchi leading to the lungs run parallel to each other instead of splitting apart from one another as in monitors and other terrestrial reptiles. In mosasaurs, these features may be internal adaptations to a fully marine lifestyle.
Mosasaurus hoffmannii skeleton, Natural History Museum of Maastricht, The Netherlands.
Sea levels were high during the Cretaceous Period, causing marine transgressions in many parts of the world and a great inland seaway in what is now North America. Mosasaur fossils have been found in the Netherlands, Denmark, Portugal, Sweden, the United Kingdom, Angola, Morocco, Australia, New Zealand, and on Vega Island off the coast of Antarctica. Mosasaurs have been found in Canada in Manitoba and in much of the contiguous United States. Complete or partial specimens have been found in Alabama, Mississippi, Tennessee, and Georgia -- as well as in states covered by the Cretaceous seaway: Texas, southwest Arkansas, New Mexico, Kansas, Colorado, Nebraska, South Dakota, Montana, and the Pierre Shale/Fox Hills formations of North Dakota. Lastly, mosasaur bones and teeth are also known from California, Mexico, and Peru.
Many of the so-called 'dinosaur' remains found on New Zealand are actually mosasaurs and plesiosaurs, both being Mesozoic predatory marine reptiles.
The Mosasaurus discovered in a Maastricht limestone quarry, 1770 (contemporary engraving)
The first publicized discovery of a partial fossil mosasaur skull in 1764 by quarry-workers in a subterranean gallery of a limestone quarry near the Dutch city of Maastricht, preceded any major dinosaur fossil discoveries but remained little known. However, a second find of a partial skull drew the Age of Enlightenment's attention to the existence of fossilized animals that were different from any known living creatures. When the specimen was discovered between 1770 and 1774, Johann Leonard Hoffmann, a surgeon and fossil-collector, corresponded about it with the most influential scientists of his day, making the fossil famous. The original owner though was Godding, a canon of Maastricht cathedral.
The Mosasaur skull found in Maastricht in 1764
When the French Revolutionary forces occupied Maastricht in 1794, the carefully-hidden fossil was uncovered, after a reward, it is said, of six hundred bottles of wine, and transported to Paris. After it had been earlier interpreted as a fish, a crocodile and a sperm whale, the first to understand its lizard affinities was the Dutch scientist Adriaan Gilles Camper in 1799. In 1808 Georges Cuvier confirmed this conclusion, although le Grand Animal fossile de Maëstricht was not actually named Mosasaurus ('Meuse reptile') until 1822 and not given its full species name, Mosasaurus hoffmannii, until 1829. Several sets of mosasaur remains, that had been discovered earlier at Maastricht but were not identified as mosasaurs until the nineteenth century, have been on display in the Teylers Museum, Haarlem, procured from 1790.
The Maastricht limestone beds were rendered so famous by the Mosasaur discovery that they have given their name to the final six-million-year epoch of the Cretaceous, the Maastrichtian.
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Lot Of Fossil Shark Teeth 45-70 Million Yr Old Plus Identification Poster: $12