Glacial Grooves | Clipmarks


	Glacial Grooves

amgumen

5-12-2008 10:53 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://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/82d46994-7b96-47d2-a014-d2889d72bcca/CF1B83D5-69F7-414C-A901-3A989F2D36D0/" 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.fettes.com/central%20park/Glacial%20groove.htm" href="http://www.fettes.com/central%20park/Glacial%20groove.htm" style="font-size: 11px;">www.fettes.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.fettes.com/central%20park/Glacial%20groove.htm"><P><I><FONT size="2" face="Arial, Helvetica, sans-serif">Definition: sets of 
  parallel furrows which have been ground out of rock surfaces by boulders 
  lodged in the moving sole of a glacier or ice sheet. The rock surfaces have 
  often been polished by finer debris.</FONT></I></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://www.fettes.com/central%20park/Glacial%20groove.htm"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.fettes.com/img/9BF1B319-F52D-4FDC-B820-BBF3089D8DE1" 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://www.fettes.com/central%20park/Glacial%20groove.htm">Glacial grooves can be 
  found on most outcrops in the southern part of Central Park, transecting the structures of the schist 
  bedrock. The thinnest grooves are the width of pencils and are little bigger 
  than <I>striations</I> or glacial scratches. The larger grooves are more than 30 cm 
  wide and extend for several metres across rock surfaces. The grooves are best 
  developed on the up-ice slopes of roches moutonnées, where ice was forced to 
  move uphill and where the resultant pressures intensified on the pulverising 
  blocks moving across the rock floor.</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://www.fettes.com/central%20park/Glacial%20groove.htm"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.fettes.com/img/6EFA3F23-7DE5-4521-A48B-A76BC7EFBF61" 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://www.fettes.com/central%20park/Glacial%20groove.htm"><FONT size="1" face="Arial">
              A deep groove gouged from the up-ice slope of a rock hill. Pencil 
              for scale in an image taken lying in the groove</FONT></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/CF1B83D5-69F7-414C-A901-3A989F2D36D0/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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