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Found 18 results

  1. stromatolite or stromatoporoid or what?

    The fossil I am posting today does not contain calcium. I does contain agate and my question is could it be a fossil stromatoporoid or stromatolite or something else?
  2. Campanian Stromatoporoid

    Together with these two coral colonies http://www.thefossilforum.com/index.php?/topic/96001-corals-10-11-from-the-campanian-st-bartholomä-formation-styria-austria-gosau-group-eastern-alps/ I "discovered" also this specimen during my last visit at point 25, east of Kalchberg, in St. Bartholomä. "Discovered"? - I have found this specimen about a year ago, but did not take it with me - "It´s just a mineral". As I have not found much during my last visit, so I took it with me this time... After cleaning, I saw a somewhat faint wavy lamination - "Ah, some kind of calcite deposit"... Inspection with a hand lens revealed a tiny mesh or sieve structure in some parts - "Oh, that´s interesting"... Now I asked my local fossil expert. After some pondering he said: "This looks like a stromatopora from the nearby Devonian Plabutsch-Formation!" A quick look at his voluminous library revealed, that there indeed exist Cretaceous stromatoporoids, with nice names like Actinostromaria (compare with Paleozoic Actinostroma). I don´t think, this is an Actinostromaria, but we are rather sure, that it is a Cretaceous stromatoporoid. What do you think? Thank you very much for your opinion! PS, I found also this interesting diagram, from Wood & Reitner (1988). See also: http://www.thefossilforum.com/index.php?/topic/94175-fossil-ball-campanian-st-bartholomä-formation-gosau-group-eastern-alps/ Franz Bernhard
  3. Middle Devonian Stromatoporoids

    These fossil stromatoporoids came from the Traverse formation, Potter formation, Bell Shale, and antrim/dundee formation locations near the north eastern tip of the Mitt in Michigan USA.
  4. Silurian Sponge? Coral?

    Hello, I can't seem to ID this fossil found in Silurian reef rock, Chicago area. I made some slices. Any help appreciated.
  5. Stromatoporoid?

    New to the Forum! Just a rookie looking for some help. This fossil was found just outside of Defiance, Ohio 70 yrs ago. The rock was found on the surface of a farm field, in an area not plowed. Rock is approx 8 inches in length, with its entire surface uniformly covered in bumps. Under magnification, very small crustacean type organisms can be seen embedded in the rock. At first, I thought it may be a stromatoporoid, but bumps on surface may not have enough of a conical shape....? Looking for advice on where in N.W. Ohio this could be taken for ID, if needed.
  6. I found this along the Fox River in Elgin, IL. At first I thought it was a stromatoporoid fossil (I find them everywhere in this area), but upon closer inspection I couldn't see anything that looked like pillars or laminae. Someone suggested chaetetid sponge, or a stromatoporoid that was distorted by silicification. I can't find any photos that look like my spec. except dino bone and we don't have those in northern Illinois. Is it a natural formation, crazy looking oolites? I'm totally stumped! More pics
  7. ID required.

    Please could somebody help me identify this rock I found on the beach. Many thanks in advance.
  8. Arizona Devonian Stromatoporoid

    I collected these silicified stromatoporoids from the Devonian, Frasnian Age, Martin Formation north of Payson, Arizona. The spires are 2-4 mm high and have bases 1 to 1.5 mm wide. Hexagoneria and Pachyphyllum corals occur with these. The first photo may be a difference species from the last photos since the spires are lower. Any idea what species these stromatoporoids might be?
  9. Stromatoporoid Growth Forms?

    Lately if you have seen some of the topics I've started, these trips revolve around an Ordovician reef I came across by the Credit River in Mississauga, Ontario. One of the few things I discovered while exploring these spots is that there are plenty of Stromatocerium sponges which I red is a stromatoporoid. My question is, can anyone lead me to any papers about the growth forms of Ordovician stromatoporoids? I have found specimens of stromatoporoids and from the way I see it, some of the specimens I found of the same species have different growth forms. Some have those things they call monticules on the surface, and some don't exhibit them at all. Instead these specimens exhibit cracks and splits on the surface of the organism with irregular bumps and overgrowths. I'd like to know what causes this. Some of these sponges, from what I have collected, colonize some pieces of Prismostylus on the top.
  10. I’ve been looking through last summer’s Silurian finds and noticed this Trilobite impression on this as yet unidentified coral. Would anyone know if this particular Stromatoporoid could have been soft bodied when alive due to the impression made from the Trilobite? Also any help as to what species of trilobite it could be or any suggestions as to the name of the Stromatoporoid. The Stromatoporoid is from the Wenlock series in Shropshire, UK.
  11. Hi, I was wondering if anyone had any thoughts on the ID of these fossil structures. They're found in a fossil patch reef of Bartonian age in Northern Spain, at the moment I am exploring the possibility that they could be very large oysters of some kind, they could possibly be stromatoporoid fossils though (however they don't have any obvious internal layering or structures). Other fossils nearby include small oysters and solitary and colonial scleractinian corals, along with large nummulitid foraminiferans. The layered fossils were very hard, and I was not able to take any samples, interestingly they did spark in contact with a hammer, could this be due to silicification? One of the nummulites also had a shiny metallic luster. Hope some of that helps, thanks in advance for any help.
  12. Colony 1

    I have four specimens that could be the same thing, but the appearance is different enough so that I decided to go with separate posts. They came from glacial till in north eastern Maine. The age is most likely upper Ordovician - Lower Devonian, and almost certainly they are marine. My first thought was Stromatoporoid, but they seem a bit too weak in the stromato to me. What do you think ?
  13. Stalk?

    Hi, it's my first post here. I found some fossils like this and asked about this on polish forum and i got help - it's a probably stromatoporoids. On one of them it's a something what looks like stalk. I don't know but probably is only core/internal layers (rest decay). It is possible that something gather inside (alga)? Found in southern Poland - Layer; middle or late jurrasic period. What do you think? (sorry for my english).
  14. ...The Applications of Stromatoporoid Paleobiology in Paleoenvironmental Analysis - Stephen Kershaw
  15. Ord Red algae 2

    From the album Ord. Red algae and stromatoporoid

    from Winchester, KY
  16. Ord Labechia Sp stromatoporoid

    From the album Ord. Red algae and stromatoporoid

    From Frankfort, KY
  17. Ord. Red algae

    From the album Ord. Red algae and stromatoporoid

    Found in Winchester, KY.
  18. My 1St Mystery

    I e-mailed these pictures to a geologist I know and at first she thought the stridations on this boulder might be from erosion. But as you will see in one of the pictures I post - the lines are running in opposite directions in areas that are concave. The striations "wrap around" this boulder - so although it looks like seashell-type marks, the shells would have had to have been huge as they go completely around the boulder (though admittedly, I couldn't check underneath it). The area is in New Mexico in the Santa Fe Group, Miocene Epoch (7-25 million years ago), with some pliocene patches, but is known to have had boulders wash down from the nearby Sandia Mountains, which go back to the proterozoic period. This area is at the northern end of the Sandia Mountains in the foothills. "Fossils of marine life such as brachiopods, crinoids, fusilinids and corals are evident in some of these boulders." All the fossils I have been able to identify in this general area have been sea life fossils, such as columnal crinoids, brachiopods, fusilinids, possibly an ammonite, and some possible worms. Click to make larger... The watch face is hazy with a worn bezel because it is scratched from carrying rocks (I wear it inside my wrist) - and I use a newer one for scuba diving (one that I can see ). This photo shows one side that is flattened with shell-like striations - but it is the only flat area; After going back and taking more photos, I think I found the striations cannot be due to erosion, because in this concave area they actually go in diametrically opposite directions. Anyone have any better ideas about this boulder? I have more pictures I can post if it might help.