GeologyRocksLimestone, marly limestone, marl, etc.
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geo-fizz-ics
Sun, 11/30/2008 - 22:28I need an easy field method that works with eyes, fingers, pocket knife and 10% HCl to determine if a rock is limestone, marly limestone, calcareous marl or marl. Can anyone help me out?
P.S. I think i just need conformation that I do it right. 
I'd say ...
Limestone fizzes vigourously
Marly Limestone fizzes less vigourously (as does dolomite)
Calcareous marl fizzes weakly
Marl wont fizz unless powdered and then very weakly.
Marl is 35-65% clay and 65-35% carbonate
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One of my field geology
Mon, 12/01/2008 - 18:12One of my field geology teachers told us to get a small sample and drop acid on it. If grains remain after the acid fizzes, it's a cemented sandstone/siltstone/clastic whatever. If all of the material fizzes away, it's limestone. But this also could have been meant to apply only to the section we were working on and not in general.
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Limestone, marly limestone, marl, etc.
Submitted by Mathias2007 on Sun, 11/30/2008 - 21:28.I am currently in the field without my books and documents. There is a lot of carbonates here, marlstones and claystones. I know that marls are a mixture of clayey/silty material with carbonate and there are certain percantages to give them the real names. However, I need an easy field method that works with eyes, fingers, pocket knife and 10% HCl to determine if a rock is limestone, marly limestone, calcareous marl or marl. Can anyone help me out?
P.S. I think i just need conformation that I do it right.
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