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Ammonites varied greatly in size. The largest known as small as 2 cm (0.75 in) in diameter. During the Jurassic and Cretaceous periods, ammonites evolved more streamlined shells for swimming and the structure of the shell became stronger.
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www.paleodirect.com/pgset2/amx-151.htm
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From Wikipedia, the free encyclopedia ... Pages in category "Jurassic ammonites" ... Categories: Ammonites sorted by geochronology...
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en.wikipedia.org/wiki/Category:Jurassic_ammonites
en.wikipedia.org/wiki/Category:Jurassic_ammonites
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It is therefore far from a complete record of species, but reflects those ammonites which can be found with a little luck along the Dorset Coast and at a few inland and coastal sites of Somerset. It concentrates therefore on Jurassic ammonites, particularly on those of the Lower Jurassic.
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www.fossilwalks.com/ammonites/pages/index.htm
www.fossilwalks.com/ammonites/pages/index.htm
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The maps which have been constructed for the considered ammonite taxa show that peculiar seaways like the "Hispanic corridor" (Caribbean Tethys), the "South Gondwana" (South Pacific Sea) and the "North Laurasia" (Boreal Sea) bypasses could have been used by ammonites to invade several provinces.
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bsgf.geoscienceworld.org/cgi/content/abstract/175/5/513
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...Jurassic Ammonites from Echizen and Nagato (1904) ... Book digitized by Google and uploaded to the Internet Archive by user tpb. ... Text Archive > American Libraries > ...Jurassic Ammonites from Echizen and Nagato...
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www.archive.org/details/jurassicammonit00yokogoog
www.archive.org/details/jurassicammonit00yokogoog
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Buy Jurassic Ammonites From Echizen And Nagato in India. Price:Rs.627 Discount:24%, Free Shipping on Jurassic Ammonites From Echizen And Nagato .
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www.flipkart.com/jurassic-ammonites-echizen-nagato-mata...
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Size; Ammonites have a wide range of size. Specimens have been found ranging from less than a centimeter to 2 meters in diameter. Early ammonites, until the middle Jurassic, were smaller, usually less than 9 inches or 23 centimeters.
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www.fossils-facts-and-finds.com/ammonites.html
www.fossils-facts-and-finds.com/ammonites.html
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Next; Previous; Index; Exit; Communication; Other sites...
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www.uoguelph.ca/~sadura/hisref/hist42.htm
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This taxon occurs in the Northern Calcareous Alps of Tyrol as the oldest European Jurassic type ammonite. Both subspecies characterize the first Jurassic ...
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www.ingentaconnect.com/content/schweiz/njbgeol/2009/000...
www.ingentaconnect.com/content/schweiz/njbgeol/2009/00000253/F0020002/art00001
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