Joe Salande Posted June 24, 2019 Share Posted June 24, 2019 While on a fishing hike along the coast of Alabama, I was walking on large rocks forming a jetties to the gulf. When I looked down I came across some crinoid.byrozoan fossils. I am trying to ascertain where these boulders came from as It will help me learn about these fossils. Do any of you have a clue where they could be from . I did post this question under "discussion" but didn't get a response relative to this question. These are large boulders lining an inlet and I"m confident that they are not from South Alabama seashore. Possibly if I could figure out where the boulders came from, It would help me figure out where/date of the fossils. So the question is: Where do you guys think these boulders came from? There large 3 to 5 foot boulders. They appear to be granite, but I'm no geologist". Thanks Joe Link to comment Share on other sites More sharing options...
Pumpkinhead Posted June 24, 2019 Share Posted June 24, 2019 I think that you are correct in saying that they are not from the South Alabama shore. These are carbonate rocks such as limestone or dolostone and probably Paleozoic in age 1 Link to comment Share on other sites More sharing options...
hemipristis Posted June 25, 2019 Share Posted June 25, 2019 Likely brought down the Alabama River (or ancestoral version of) from the NE part of the state where the Paleozoic Rocks occur 1 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
Plax Posted June 25, 2019 Share Posted June 25, 2019 10 hours ago, hemipristis said: Likely brought down the Alabama River from the NE part of the state where the Paleozoic Rocks occur as mined rip-rap (took a chunk out as I quoted but now realize that's rude, sorry about that) 1 Link to comment Share on other sites More sharing options...
Joe Salande Posted June 26, 2019 Author Share Posted June 26, 2019 Thanks folks. I appreciate the input. Gives me something to check into. Joe Link to comment Share on other sites More sharing options...
ClearLake Posted June 26, 2019 Share Posted June 26, 2019 On 6/24/2019 at 1:38 PM, Joe Salande said: I"m confident that they are not from South Alabama seashore. On 6/24/2019 at 1:38 PM, Joe Salande said: . They appear to be granite, As others have mentioned, you are correct, they are not “native” to the Alabama coast. They have been brought in to help stem erosion. The nearest limestone quarry is up near Auburn, but these could have come from just about anywhere as they were probably barged in. They are definitely not granite, at least not the ones with fossils as granite is an igneous rock, not a sedimentary rock. It’s always fun to find some fossils where you least expect them! 2 Link to comment Share on other sites More sharing options...
hemipristis Posted June 26, 2019 Share Posted June 26, 2019 15 hours ago, Plax said: as mined rip-rap (took a chunk out as I quoted but now realize that's rude, sorry about that) Ah, didn't think about the possibility that the river had rip-rap. Yup, that'll do it. eta: I"m in no position to criticize someone for chipping off a piece of riprap.... 1 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
hemipristis Posted June 26, 2019 Share Posted June 26, 2019 2 hours ago, ClearLake said: t’s always fun to find some fossils where you least expect them! Ain't that the truth! Amongst my most cherished fossils, because of their rarity, are my Hawaiian shark teeth and fish fossils, and my fossil porcupine fish jaw from Guam, for that very reason 1 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
Plax Posted June 26, 2019 Share Posted June 26, 2019 We have limestone quarries in abundance here in the Cape Fear region but during the building boom of the late 90s we actually imported crushed rock from the bahamas. I can't see a string of islands having enough terra firma to spare but thats economics. 1 Link to comment Share on other sites More sharing options...
hemipristis Posted June 26, 2019 Share Posted June 26, 2019 2 hours ago, Plax said: We have limestone quarries in abundance here in the Cape Fear region but during the building boom of the late 90s we actually imported crushed rock from the bahamas. I can't see a string of islands having enough terra firma to spare but thats economics. Seriously? LOL. That's funny. 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
Plax Posted June 26, 2019 Share Posted June 26, 2019 yep, no joke! Link to comment Share on other sites More sharing options...
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