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Tim4d
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Petrified Rock
Oct 28th, 2016 at 7:22pm
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There was about 45 minutes of daylight and dusk left when I dropped Rebecca off at the big Jo Anne's in Midlothian. This northwestern corner of Chesterfield County, VA near Richmond is known to have a weakly lithified petrified wood, sometimes with a sugary druzy of quartz. I bought a small piece from nearby Packards Rocks & Stamps Shop a while ago but had yet to search for digging spot one. I set out for a new road being built to extend through open land to the highway. Found nothing there, but a small road cut on the way produced this. It is a crumbly piece of barely lithified sandstone, subsequently silicified with little vein-lets of quartz. If so, that would be consistent with an environment that produced the barely lithified petrified wood with occasional minor druzy. 
  

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Tim4d
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Re: Petrified Rock
Reply #1 - Oct 28th, 2016 at 7:29pm
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Judging from the road cut, the host strata was at one time turbulent flood deposit -- mix of egg size and larger river rocks with red sand and clay. Today that spot is on the ridge separating the James and Appomattox rivers watersheds, if I'm reading the map right.
  
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Tim4d
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Re: Petrified Rock
Reply #2 - Oct 28th, 2016 at 7:41pm
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Nice, the VA DMME interactive geology map now works on the smart phone. So yes, the road cut is "terrace deposits - undifferentiated
Age Estimation      Tertiary".
  
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Tim4d
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Re: Petrified Rock
Reply #3 - Oct 28th, 2016 at 7:45pm
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Also in the area near where I'm assuming the petrified wood is found are units of the "Newark Supergroup - sandstone, siltstone, shale and (in places, coal) interbedded." That could certainly produce pet wood too. The colonial era coal mines are nearby.
  
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Tim4d
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Re: Petrified Rock
Reply #4 - Oct 28th, 2016 at 7:51pm
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So now I wait for Rebecca to finish her knitting class. She has crocheted all her life and now wants to try knitting too.
  
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Tim4d
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Re: Petrified Rock
Reply #5 - Oct 28th, 2016 at 7:55pm
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Oh. Also found at the road cut was this spherical "bridge stone".
  

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JoeM
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Re: Petrified Rock
Reply #6 - Oct 29th, 2016 at 8:44pm
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No matter how major, or meager, news is news. Thanks for the report, tim. Smiley
  
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