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Type of Rock? 2
- Thread starter akvargas
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1
- #2
Could be...but why don't you take a piece of the rock, break it in half, photograph it against a contrasting background, then post the photo here. Your photo doesn't give us an idea of which rock specimen you are referencing and we can't see enough detail to distinguish between an agglomerate or an igneous rock with inclusions.
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- #3
You have to start at the regional scale. Where was the photo taken (what Physiography)? Is there a state published geologic map? Most states have regional maps that will show you the regional geologic formation names, their ages and the types of rocks found within the formation (recognizing that some formations are massive and have one principal rock type and other formations are stratified and have similar, but varied rock types).
Clearly this is some lithic conglomeration. That said, the lithic pieces (large rocks floating in the matrix) may be sedimentary, metamorphic or igneous origin. Also, how hard is the matrix and what is its mineralogy?
How would a rock like this form? The answer to this may be found from the regional publications or the local setting (I mean is this rock type seen hear and there over a large area, or is the more typical rock type one thing, but here's this odd-ball item). If just an odd-ball rock mass, I mean it could be a cemented rock slide.
So, I'm not saying what it is - I mean why call it an agglomerate if there are no volcanos about?
If given the option you can always call it, "leaverite" - as it leave 'er right there - ha!
f-d
p.s., I'm also a registered geologist, became an engineer after doing geologic field work for 8 years.
¡papá gordo ain’t no madre flaca!
Clearly this is some lithic conglomeration. That said, the lithic pieces (large rocks floating in the matrix) may be sedimentary, metamorphic or igneous origin. Also, how hard is the matrix and what is its mineralogy?
How would a rock like this form? The answer to this may be found from the regional publications or the local setting (I mean is this rock type seen hear and there over a large area, or is the more typical rock type one thing, but here's this odd-ball item). If just an odd-ball rock mass, I mean it could be a cemented rock slide.
So, I'm not saying what it is - I mean why call it an agglomerate if there are no volcanos about?
If given the option you can always call it, "leaverite" - as it leave 'er right there - ha!
f-d
p.s., I'm also a registered geologist, became an engineer after doing geologic field work for 8 years.
¡papá gordo ain’t no madre flaca!
- Thread starter
- #4
msquared48
Structural
Being in a volcanic region, it kind of looks like remnants of an old mudflow to me with all the included rocks of different types and sizes. Reminds me of the aftermath of Mt. St Helens and those mudflows.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
msquared48
Structural
Yep...
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
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