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How do I find the source of rock fragments?
I am outdoors a lot and find various small rocks such as quartz and obsidian laying on the ground. I found a large amount of obsidian on the top of a small hill and that got me to wondering if the source would be directly below.
So, what is usually the most productive method of finding the source of rock fragments? Do I simply start digging right where I found the small fragments or is there a more sure method?
1 Answer
- DickLv 610 years agoFavorite Answer
You need to locate the main rock formation.
In the case of obsidian, you need to locate igneous formations in the local area. A seam of obsidian that intrudes into another formation confirms it's origin.
Be careful. If you are in an area that had been covered by glaciers, then the rock's source may be a long way away.
You can also check on line for the geological history of you local area. Geological maps exist for all of the USA and other countries. They show the rock formations as well as a cross section that shows the strata.
