Packrat Midden | Clipmarks


	Packrat Midden

amgumen

5-12-2008 7:53 PM

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.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://content.clipmarks.com/blog_embed/ac0b0573-03d9-402e-89b7-1973e2be208a/CFFE6DDF-85C5-4E81-BFC1-A520DB6E5CC3/" 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://geology.about.com/library/bl/images/blpackratmidden.htm" href="http://geology.about.com/library/bl/images/blpackratmidden.htm" style="font-size: 11px;">geology.about.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://geology.about.com/library/bl/images/blpackratmidden.htm"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/geology.about.com/img/C5BC424E-C940-481D-892C-88ACF48C0717" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://geology.about.com/library/bl/images/blpackratmidden.htm"><P>Various species of packrats live in the world's deserts, relying on plant matter for their entire intake of water as well as food. They gather vegetation in their dens, sprinkling the stack with their thick, concentrated urine. Over the centuries these packrat middens accumulate into rock-hard blocks, and when the climate changes the site is abandoned.
</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://geology.about.com/library/bl/images/blpackratmidden.htm"><P>Packrat middens are found in the Great Basin, of Nevada and adjoining states, that are tens of thousands of years old. They are examples of <A href="http://geology.about.com/od/fossilstimeevolution/a/aa_oldDNA.htm">pristine preservation</A>, precious records of everything that local packrats found interesting in the late Pleistocene, which in turn tells us much about the climate and ecosystem in places where little else remains from those times.
</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://geology.about.com/library/bl/images/blpackratmidden.htm">isotopic analyses of urine crystals can read the record of ancient rainwaters. In particular, the isotope chlorine-36 in rain and snow is <A href="http://geology.about.com/library/weekly/aa082497.htm">produced in the upper atmosphere by cosmic radiation</A>; thus packrat urine reveals conditions far above the weather.</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/CFFE6DDF-85C5-4E81-BFC1-A520DB6E5CC3/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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