David Cox III @david-coxiii
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5 days, 20 hours agoDavid Cox III posted an update in the group Vacation Explorers
The attached photos show a specimen I picked up in a rock shop in North Carolina many years ago. They said it was from Pennsylvania or Ohio if I remember correctly (I could be mistaken). Anybody have any thoughts on what it might be? Sorry for the glare in the phone photos. I can take more with an SLR if need be. Thanks.
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1 week, 3 days agoDavid Cox III posted a new activity comment
Were the ants invited guests or did they party crash?
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1 week, 3 days agoDavid Cox III posted a new activity comment
megalodon and gompothere.
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1 week, 6 days agoDavid Cox III posted a new activity comment
Thank you!
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1 week, 6 days agoDavid Cox III posted an update in the group Nebraska Badlands
View across the Nebraska Badlands as a storm builds.
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Awesome photo @david-coxiii !
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Thank you!
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3 weeks, 3 days agoDavid Cox III posted a new activity comment
Who is this bird you speak of? Wren from Carolina or Virginia Rail? One must be careful, Red is knot the one you should listen to. When Brandt and that loon Jay get together there are some tall tails. Cliff’s stories are hard to swallow. Was Phoebe telling the truth or just parroting Myna? Townsend will warble more than he knows, like his friend Magnolia. You can trust Ruddy, he will leave no stone unturned. A cardinal principle is to watch what this flock does. Talk is chirp.
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3 weeks, 6 days agoDavid Cox III posted an image in the group Florida’s Fossils from the myFOSSIL app
End view of turtle shell showing interior structure. Bone Valley Formation, Polk County, FL
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Wow! How neat that the porous interior preserved so well!
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impresive preservation
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3 weeks, 6 days agoDavid Cox III posted an image in the group Florida’s Fossils from the myFOSSIL app
Here are some better photos of the larger piece. The inside structure is really interesting
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3 weeks, 6 days agoDavid Cox III posted an image in the group Florida’s Fossils from the myFOSSIL app
Turtle shell pieces from Agricola Mine, Polk County, FL. Bone Valley Formation #fossil
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4 weeks agoDavid Cox III posted a new activity comment
The labels look like they came from a fossil company that used to sell mail order in the late 1960’s. I can’t remember the name of the company, but they did have pretty good data on their specimens. I want to say they we out of Texas, but I could be mistaken.
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1 month agoDavid Cox III joined the group GABI-RET 2018 Cohort 6-The North American Connection
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1 month agoDavid Cox III posted an image in the group Bookworms from the myFOSSIL app
Fossil collecting in the American West in the late 19th and early 20th century. What Sternberg was able to accomplish was amazing. #fossil #method
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I just got my own copy a few weeks ago, as well!
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1 month agoDavid Cox III joined the group Bookworms
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1 month, 2 weeks agoDavid Cox III posted a new activity comment
Fossils of Gumby? I’m not dating the specimens, but I might be dating myself.
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2 months, 1 week agoDavid Cox III posted a new activity comment
Barracuda?
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3 months agoDavid Cox III posted a new activity comment
or one on Mesozoic trees called “Jurassic Bark”
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3 months, 1 week agoDavid Cox III joined the group Florida’s Fossils
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4 months, 1 week agoDavid Cox III posted a new activity comment
Mike, thanks for the great explanation. Very thorough. I look forward to hearing the results.
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4 months, 1 week agoDavid Cox III posted a new activity comment
Mike, could you give a bit of detail on what we are looking at in this photo? How is a paleomag sample collected and prepared? Just the very basics would be great. Thanks.
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Of course! Montbrook paleomagnetism sediment samples were collected throughout the section to compare results from the top and bottom. All sample orientations were recorded in the field as well as on the sample themselves (that’s the black arrow you see on the pictured sediment). Since we all know how crumbly the sand-dominated Montbrook sediments can be, a heavy coat of lacquer was applied to harden the sample as well as ‘lock’ in the position of sediment grains. Back in the lab (in this case, my garage), a diamond tipped rock saw is used to cut the larger samples into smaller ~2.3cm cubes (standard size for the machinery used to conduct paleomagnetic analysis). Ideally, each larger sample will be worked into 4 of these smaller cubes. Cubed samples are wrapped in tin foil for rigidity/protection while they are being stored!
-3 cubes are prepped to determine remanant paleomagnetic orientation, so it is essential that the direction of the black arrow from the larger sample translates over into these smaller samples. Why 3 samples? At least three samples are needed for analysis in order to be statistically significant. As with most things in science, the more repetitions/tested samples we can get, the better!
– 1 other sample is prepped and designated for composition analysis in order to test what minerals within the Montbrook sediment lend themselves to magnetization (ex: hematite/magnetite).All in all, I have about 50 samples prepped. Paleomagnetism will not give us an exact age, but it is a great method to support the site’s estimated age which has been suggested strictly through vertebrate biochronology. With any luck, we may see a reversal in earth’s magnetic poles from the top of the geologic sequence from the bottom. If so (fingers crossed), this can be compared to well-documented magnetic records from the Late Miocene to further constrain the age of Montbrook!
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Mike, thanks for the great explanation. Very thorough. I look forward to hearing the results.
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4 months, 1 week agoMax Jones and David Cox III are now friends - Load More
