Search the Community
Showing results for tags 'erosion'.
Found 14 results
-
Hey everyone! I found this outside a small kettle hole on the east end of Long Island. Can someone tell me what I’m looking at? And because I’m hopeful for petrified wood, perhaps I can be shown what to look for and what to avoid. I have more photos, but I didn’t want to flood the site with my first post. Thank you!
-
I’m very curious about these “ripple marks” that I have seen posted a few times on the forum. From what little research I have been able to do (so far...) they seem to be caused by wind or water erosion of the rock. However, there is mention of them possibly being fossilized rippled sediment from the floor of a body of water. So... are these geological erosions or some type of fossilized evidence of water movement? I can see how the erosion would work, but wouldn’t the sediment be compressed during lithification/fossilization and destroy the details if it was from a body of water millions of years old? Ripple Marks Mention of Fossilization
-
So I've got this theropod indet tooth that's from the elrhaz formation, or so the seller claims anyway. The tip is missing and I'm wondering if it's due to feeding wear or erosion? The tooth seems to have been quite worn by the owner, the distal carinae is almost worn away, but i suspect it's also eroded some. The angle of the break makes me think it's feeding wear, but il not certain. Any help is appreciated! @Troodon @pachy-pleuro-whatnot-odon
-
Hi! I found these unusual looking pieces of flint on the Thames foreshore. Is this pitted flint (and is this the right term for it)? I have read online that pitted flint was formed during the last Ice Age, but does flint require permafrost conditions to experience pitting like this or can it form under normal Winter frost conditions (I live in London, England BTW)? Thank you for your time & any help is appreciated!
-
San Antonio, Tx 78023 I found the below rock in my yard last Friday. Looks like it’s part of a set. Would these have have formed from erosion?
-
Hello all I have an unusual request for you all. I would like to see the results of prolonged weathering of in-situ fossils. So I was wondering if someone here has ever seen a fossil in-situ they didn't think was possible to extract, and a fossil of the same, or similar piece worn away sometime later. Ideally with an estimated time for the fossil to wear down. The turtles of the White River formation are the first thing that come to mind about this, but trackways should be possible too. The more impressive the fossils is, the better. Additionally, a picture of a specific natural spot (clif, badlands...) with a picture of the same spot over a period of time, to see how quick the environment can change the view of the landscape. I'm aware it's an unusual request, but this isn't something you can easily find on the internet. Hope I made some sense throughout this post. Thanks in advance.
- 4 replies
-
- 1
-
-
- elements
- environment
- (and 2 more)
-
Interesting rock with scale-like internal erosion
Pleuromya posted a gallery image in Member Collections
From the album: Fossils found with my bantams. Northamptonshire.
-
Hi everyone. I found this piece of Missouri chert in a creek bed, but I am not sure if it is coral or just erosion. I have seen other pictures of coral that look similar to this, but I do not see any biological pattern or clues that this was once alive like you can see in something like a crinoid. Any help or tips would be appreciated
-
A couple of weeks ago I posted here about the working of chemical erosion on some ammonites which I had found in a furrow between 2 fields. I went back there again this week and continued along, pulling out a few more. The furrow dipped down a bit into a sort of hollow where it became obvious that the water had collected there more profusely than above over the years and the finds became more and more eroded until it reached the point where the digging was hardly worth it any more. There were however a couple of quite interesting finds which I'd like to post here. They derive from Macrocephalites ammonites, but have been eroded away to such a point that the (usually invisible) septal chambers and walls can be seen right into the center.
- 11 replies
-
- 16
-
-
- erosion
- macrocephalites
- (and 1 more)
-
Fossils are nature’s memento mori; blunt reminders that everything dies and has been doing so since the dawn of life on our ancient planet. To me, that’s a comfort, and something I think about a lot when I’m on a hunt. But today I came about fifty feet (or one brief pause to bend down to pick up a specimen) from being crushed by a rockslide near Roosevelt Cliffs at Calvert. So I’m not going to share what I found there today. No stupid shark tooth is cool enough to die for. I just wanted to reiterate here that Calvert is a living (or dying) geological feature and that it can kill you. Don’t stand near the foot of the Cliffs. Having seen a rockslide, I can tell you that there is no warning when the rock gives away, just the echo of tons of ancient ocean floor returning to sea level. It’s scary. Please be careful.
- 6 replies
-
- 8
-
-
- calvert cliffs
- erosion
- (and 1 more)
-
Travel back to when the Chesapeake Bay was first formed to learn about the geologic history of the region: https://www.chesapeakebay.net/discover/ecosystem/bay_geology Of note are the role a meteor crater played, and the estimation that Calvert Cliffs have eroded west about 300 ft. in the last 400 years.
-
Can Rivers Cause Earthquakes? If so, it could help explain some quakes that happen far from tectonic-plate boundaries, By Charlie Shobe, Scientific American, Dec. 18, 2018 https://blogs.scientificamerican.com/observations/can-rivers-cause-earthquakes/ Rivers can cause earthquakes, geologists claim By Brooks Hays, UPI https://www.upi.com/Rivers-can-cause-earthquakes-geologists-claim/5161545400911/ UK Researcher Suggests Rivers May Cause Earthquakes By Jenny Wells, University of Kentucky, Dec. 21, 2018 https://uknow.uky.edu/research/uk-researcher-suggests-rivers-may-cause-earthquakes The paper is: Gallen, S.F. and Thigpen, J.R., 2018. Lithologic Controls on Focused Erosion and Intraplate Earthquakes in the Eastern Tennessee Seismic Zone. Geophysical Research Letters, 45(18), pp.9569-9578. https://www.researchgate.net/publication/327600717_Lithologic_Controls_on_Focused_Erosion_and_Intraplate_Earthquakes_in_the_Eastern_Tennessee_Seismic_Zone https://www.researchgate.net/profile/Ryan_Thigpen https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018GL079157 Yours, Paul H.
- 4 replies
-
- 5
-
-
- earthquakes
- erosion
- (and 4 more)
-
There is a small road cut exposure I like to frequent in the Plattsburg fm. where the Hickory Creek shale is excavated at a relatively shallow angle. The whole formation it extremely fossiliferous, but specimens with great preservation require diligent and persistent searching. But, to the subject of this post, an interesting means of finding those great fossils is in timing a good rain with a day or two of drying and wind erosion. The shale is very loose and it seems that what happens is fossils (and of course 'just rocks') of certain weights and sizes hold their ground while the shale erodes away underneath them. I've affectionately, though probably not originally, coined them as being pedestaled. Here are a few recent examples: Orodus(?), Cladodont fragment, and Horn Coral
-
While looking on Pleecan's Ediacaran Facebook group, I saw a post about a fossil-surface in Newfoundland, Canada that is now lost to coastal erosion. I've heard of other sites like this that will be and have been lost to erosion or construction because they can't be removed for one reason or another. I think it should be possible to 'rescue' these fossils surfaces by recording as much data from them as possible including making molds of them and then casting a replica of the surface for display and study. Does anyone know of any existing projects like this?
.thumb.jpg.cb88c97ca44ff724e517ee144b4b7adc.jpg)
