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Post by Coolkat on Mar 22, 2017 8:56:08 GMT -8
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desert dweller
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Post by desert dweller on Mar 28, 2017 9:20:55 GMT -8
A sedimentary conglomerate would be another term for it.
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Post by Coolkat on Mar 28, 2017 9:23:05 GMT -8
Yeah you're right... if you have to get scientific! lol Actually don't mind when someone like bp2go, comes tell us about plants and flowers in the other thread.
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BigLoad
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Post by BigLoad on Mar 28, 2017 10:34:49 GMT -8
A sedimentary conglomerate would be another term for it. It doesn't even look lithified to me, but maybe I just can see it well enough from here. It looks more like compacted alluvium.
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Post by Coolkat on Mar 28, 2017 10:37:06 GMT -8
It doesn't even look lithified to me Ok... I'm all ears. what does lithified mean?
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BigLoad
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Post by BigLoad on Mar 28, 2017 10:47:26 GMT -8
It doesn't even look lithified to me Ok... I'm all ears. what does lithified mean? Consolidated into full-fledged stone. Was the sand firmly cemented? It's hard to tell whether it's still sand, or just has some surface weathering. There's very little (almost no) actual sedimentary rock exposed there. There are alluvial deposits eroded from the young volcanics and older metamorphic rocks.
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Post by Coolkat on Mar 28, 2017 10:51:49 GMT -8
Ok. Now this is what I like about this forum. Talking to people who know what they are talking about. Without understanding all the scientific jargon are you saying that is in a stage too early to be called pudding stone?
The substance holding the stones together was just as hard or harder than cement. Or it seemed so to me.
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BigLoad
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Post by BigLoad on Mar 28, 2017 11:28:01 GMT -8
OK, that sounds lithified, and pudding stone would be right for that as a common name.
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desert dweller
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Post by desert dweller on Mar 29, 2017 8:29:52 GMT -8
Compacted alluvium makes sense considering the area. I chose "sedimentary conglomerate" based primarily on images posted on Google. There are many examples there. Funny though, when I looked for images of "Compacted alluvium" there was not a single example in the images. What I did see was a couple of pictures of sides of washes showing the exposed alluvium fill where the seasonal active wash cut through.
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BigLoad
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Post by BigLoad on Mar 29, 2017 8:48:04 GMT -8
Compacted alluvium makes sense considering the area. I chose "sedimentary conglomerate" based primarily on images posted on Google. There are many examples there. Funny though, when I looked for images of "Compacted alluvium" there was not a single example in the images. What I did see was a couple of pictures of sides of washes showing the exposed alluvium fill where the seasonal active wash cut through. Yeah, I don't think "compacted" corresponds to an official designation. I added it to distinguish something that's approaching a lithic state. Without knowing the precise location, I can't say whether this is pre- or post-volcanic. Because the volcanics in the Supes are typically thousands of feet thick, unconsolidated alluvium is the normal scenario. However, in some places, the volcanics covered existing alluvial deposits to considerable depth and subsequently eroded off, re-exposing them in a now more compacted condition. Among the handful of places that I've seen older metamorphic rocks on the surface is toward the south end of Rogers Canyon, so I can't rule out Coolkat having come across some.
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Post by autumnmist on Mar 29, 2017 8:55:06 GMT -8
BigLoad, how can you tell the metamorphic rock from the sedimentary rock? I took one geology class and had to examine the rocks very very closely to determine what kind they were. I still have trouble determining categories. I gather you're using the geology of the area for insight? You have an excellent knowledge of rocks; are you a geologist? You're making me want to search for my old geology text and reread it!
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BigLoad
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Post by BigLoad on Mar 29, 2017 9:19:58 GMT -8
BigLoad , how can you tell the metamorphic rock from the sedimentary rock? I took one geology class and had to examine the rocks very very closely to determine what kind they were. I still have trouble determining categories. I gather you're using the geology of the area for insight? You have an excellent knowledge of rocks; are you a geologist? You're making me want to search for my old geology text and reread it! I'm simply a well-read amateur with a great interest in that area. Some of the metamorphics around there are unmistakeable: schist and gneiss. Because the area abounds in granite stocks and plutons, there's also a lot of contact metamorphism on their peripheries. Desert dweller, in particular is surrounded by mountain ranges that are metamorphic core complexes.
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amaruq
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Post by amaruq on Mar 30, 2017 11:15:16 GMT -8
Oh boy, reading some of these posts makes me feel like I'm being dragged back a decade to my geotechnical courses and even further back to my geology courses.
I should find some time to dig out some of my more geologically interesting photos. Especially some of my work ones.
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herm
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Post by herm on Apr 2, 2017 8:03:07 GMT -8
I have a little knowledge in the field of geology🤓⛏ (Bachelor of Science from CSU Fullerton). To my eye, the mass pictured does not appear to be "in situ" meaning it is out of place and likely transported to its current location from elsewhere. The mass could have been carried as part of a flash flood, a debris flow, or simply a rockfall from above. Is there an outcrop of similar rock nearby? Sitting next to my wife, who has a Master of Science in Geology (we met in the department at CSUF), she thinks the mass pictured appears to be lithified. The real question is source, and the picture just doesn't provide enough info to definitively state. I am a geek!
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Post by Coolkat on Apr 3, 2017 4:17:11 GMT -8
The real question is source, and the picture just doesn't provide enough info to definitively state. Hi herm, I believe that picture was taken on day 2 of my hike and the best I can do to give you an idea of the surroundings is to show you a picture a yards up the trail. It's probably not going to help much. You probably want to see more of the surrounding mountain. But your input and that of BigLoad is why I enjoy learning here. 2017 Superstitions Hike 058 by Hiker88, on Flickr
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