Jurassic Start: Fossil Pushes Tyrannosaurs' Origin Back 10 Million Years


	Jurassic Start: Fossil Pushes Tyrannosaurs' Origin Back 10 Million Years
clip-on-tie
11-4-2009 8:16 PM
98 views
tags:
t-rex
clip-on-tie says:
Proceratosaurus was quite small compared with T. rex but it extends the tyrannosauroid group further back to the middle Jurassic, farther than any other known fossil
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11-5-2009 12:59 AM
Jorjor
I recently saw some information that suggests the possibility that some fossils that have been identified as independent species may actually be immature versions of other types, meaning that there may be fewer known species than we think.
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                                <P><IMG width="600" alt="" src="http://farm3.static.flickr.com/2103/2243769168_2b2fd433c3_b.jpg" /></P></DIV></DIV></blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content7.clipmarks.com/images/clip-icon.gif" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.scientificamerican.com/article.cfm?id=jurassic-tyrannosaur-fossil" href="http://www.scientificamerican.com/article.cfm?id=jurassic-tyrannosaur-fossil" style="font-size: 11px;">www.scientificamerican.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.scientificamerican.com/article.cfm?id=jurassic-tyrannosaur-fossil"><EM>Tyrannosaurus rex</EM> and its relatives were North America's <A href="http://www.scientificamerican.com/article.cfm?id=t-rex-protein-sequenced-similar-to-chicken">dominant predators</A> in the late Cretaceous period, about 99 million to 65 million years ago, but a new analysis of a toothy fossil skull suggests that the early history of this group includes smaller meat-eating ancestors that date as far back as 170 million years ago.</blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content8.clipmarks.com/images/clip-icon.gif" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.copytaste.com/c15d70bn" href="http://www.copytaste.com/c15d70bn" style="font-size: 11px;">www.copytaste.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.copytaste.com/c15d70bn"><DIV class="postInfo"><UL><li style="margin-left:16px;padding-left: 0px;"><B></B></LI>
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                                <P><IMG width="600" height="600" alt="" src="http://farm1.static.flickr.com/127/321326827_04f8274830_o.jpg" /></P></DIV></DIV></blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content9.clipmarks.com/images/clip-icon.gif" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.scientificamerican.com/article.cfm?id=jurassic-tyrannosaur-fossil" href="http://www.scientificamerican.com/article.cfm?id=jurassic-tyrannosaur-fossil" style="font-size: 11px;">www.scientificamerican.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.scientificamerican.com/article.cfm?id=jurassic-tyrannosaur-fossil">The skull belongs to the only known specimen of <EM>Proceratosaurus</EM>, which now represents the oldest known relative of <A href="http://www.scientificamerican.com/article.cfm?id=if-t-rex-fell-how-did-it"><EM>T. rex</EM></A> and its cousins, extending the evolutionary history of tyrannosaurs back to the middle of the Jurassic period</blockquote><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content6.clipmarks.com/images/clip-icon.gif" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.copytaste.com/w35d71ng" href="http://www.copytaste.com/w35d71ng" style="font-size: 11px;">www.copytaste.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.copytaste.com/w35d71ng"><DIV class="postInfo"><UL><li style="margin-left:16px;padding-left: 0px;"><B></B></LI>
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