Matt Willemsen
You mean . . . . ?? ! ! !
9,000-year-old rock art discovered among dinosaur footprints in Brazil
https://www.livescience.com/archaeology/9000-year-old-rock-art-discovered-among-dinosaur-footprints-in-brazil #Brazil #precolumbian #RockArt #petroglyphs #DinosaurTracks #cretaceous #footprints #Kiriri
9,000-year-old rock art discovered among dinosaur footprints in Brazil

Ancient hunter-gatherers created rock art next to dinosaur footprints in what is now Brazil.

Live Science
Mar 31, 2024 at 9:59amSpoutible
Show threadJayMar 31, 2024
@mattotcha the footprints were already fossilised but I love the idea
Show threadBlippy the Wonder Slug 🇩🇪Mar 31, 2024
@mattotcha
It's still happening today!
Show threadCat WestMar 31, 2024
@mattotcha There has to be a way of dating rocks, right? Like Carbon dating for organics, etc. Be nice if we could know approx when the alterations were made. Hello? #Geologists ?
Show threadAlaricApr 1, 2024
@Catawu @mattotcha yes you can date rocks but it's harder with sedimentary unless you find fossils (cause the sand grains etc come from older rocks)
Show threadCat WestApr 1, 2024
@spinal @mattotcha What is the process called? Or is it relying on fossils and is a form of carbon dating? My question is probably impossible. Because we may know how old a rock is, how do we divine the age/time period of the carvings on them? It would be interesting to know when (therefore have a good guess as to whom might have) been carved. Paint is different. I get that.
Show threadAlaricApr 2, 2024
@Catawu @mattotcha Hmm yeah three different ages of interest here - the carvings you would apply anthropological knowledge to help date them plus you could look at how weathered they are. Fossil prints are of another age which would be the same as the age of the stone. Then the individual grains would be older still and if they were suitable you could date some of the minerals in them using things like potassium argon dating which uses the ratio of very slow decaying isotopes.
Show threadCat WestApr 2, 2024
@spinal @mattotcha Ahhh! Thank you. I had part of it backwards thinking that dating the carvings would tell us when people were there, when it’s the other way around. The weathering part must be tricky. Isotopes OTH seem like it would be the most accurate part of the process. Thank you for taking the time.
Show threadCat WestMar 31, 2024
@mattotcha BTW, that is a lovely circle.