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Found 20 results

  1. Encope tamiamiensis

    The sample image here was collected directly from a Drag Line operator's windrow in a lime rock mine in Southern FL just outside of Naples around the Sable Palm area of the Big Cypress swamp of the Everglades in 1997. The specimen has been completely removed from the limestone petrol (lime rock low density ls) matrix. What is interesting is the general shape of the specimen and how this 5 million year old specimen differs from the present day specimen at the same general location. I am guessing the seas of which the archaic specimens existed in were more challenging to exist in general as the specimen appears more elongate than present day specimen possibly for navigational purpose in higher energy seas than say today. Consequently the respiratory flower on top seems to be larger than today's comparable specimen as a direct consequence in the different morphology.
  2. I saw this and thought it was pretty wild as I've been poking around in the Tamiami here in Florida for quite awhile--not sure I've ever noticed one. I dont have full access to the pdf but heres the abstract and article in ScienceDaily. @MikeR Regards, Chris https://www.sciencedaily.com/releases/2019/07/190722132520.htm Cosmic pearls: Fossil clams in Florida contain evidence of ancient meteorite Date: July 22, 2019 Source: Florida Museum of Natural History Summary: Researchers picking through the contents of fossil clams from a Sarasota County quarry found dozens of tiny glass beads, likely the calling cards of an ancient meteorite. Share: FULL STORY Credit: © trahko / Adobe Stock Researchers picking through the contents of fossil clams from a Sarasota County quarry found dozens of tiny glass beads, likely the calling cards of an ancient meteorite. Analysis of the beads suggests they are microtektites, particles that form when the explosive impact of an extraterrestrial object sends molten debris hurtling into the atmosphere where it cools and recrystallizes before falling back to Earth. They are the first documented microtektites in Florida and possibly the first to be recovered from fossil shells. Mike Meyer was a University of South Florida undergraduate when he discovered the microtektites during a 2006 summer fieldwork project led by Roger Portell, invertebrate paleontology collections director at the Florida Museum of Natural History. As part of the project, students systematically collected fossils from the shell-packed walls of a quarry that offered a cross-section of the last few million years of Florida's geological history. They pried open fossil clams, washing the sediment trapped inside through very fine sieves. Meyer was looking for other tiny objects -- the shells of single-celled organisms known as benthic foraminifera -- when he noticed the translucent glassy balls, smaller than grains of salt. "They really stood out," said Meyer, now an assistant professor of Earth systems science at Harrisburg University in Pennsylvania. "Sand grains are kind of lumpy, potato-shaped things. But I kept finding these tiny, perfect spheres." After the fieldwork ended, his curiosity about the spheres persisted. But his emails to various researchers came up short: No one knew what they were. Meyer kept the spheres -- 83 in total -- in a small box for more than a decade. "It wasn't until a couple years ago that I had some free time," he said. "I was like, 'Let me just start from scratch.'" Meyer analyzed the elemental makeup and physical features of the spheres and compared them to microtektites, volcanic rock and byproducts of industrial processes, such as coal ash. His findings pointed to an extraterrestrial origin. "It did blow my mind," he said. He thinks the microtektites are the products of one or more small, previously unknown meteorite impacts, potentially on or near the Florida Platform, the plateau that undergirds the Florida Peninsula. Initial results from an unpublished test suggest the spheres have traces of exotic metals, further evidence they are microtektites, Meyer said. Most of them had been sealed inside fossil Mercenaria campechiensis or southern quahogs. Portell said that as clams die, fine sediment and particles wash inside. As more sediment settles on top of the clams over time, they close, becoming excellent long-term storage containers. "Inside clams like these we can find whole crabs, sometimes fish skeletons," Portell said. "It's a nice way of preserving specimens." During the 2006 fieldwork, the students recovered microtektites from four different depths in the quarry, which is "a little weird," Meyer said, since each layer represents a distinct period of time. "It could be that they're from a single tektite bed that got washed out over millennia or it could be evidence for numerous impacts out on the Florida Platform that we just don't know about," he said. The researchers plan to date the microtektites, but Portell's working guess is that they are "somewhere around 2 to 3 million years old." One oddity is that they contain high amounts of sodium, a feature that sets them apart from other impact debris. Salt is highly volatile and generally boils off if thrust into the atmosphere at high speed, Meyer said. "This high sodium content is intriguing because it suggests a very close location for the impact," Meyer said. "Or at the very least, whatever impact created it likely hit a very large reserve of rock salt or the ocean. A lot of those indicators point to something close to Florida." Meyer and Portell suspect there are far more microtektites awaiting discovery in Florida and have asked amateur fossil collectors to keep an eye out for the tiny spheres. But no one will be recovering microtektites from the original quarry any time soon. It's now part of a housing development. "Such is the nature of Florida," Meyer said. Peter Harries of North Carolina State University also co-authored the study. Story Source: Materials provided by Florida Museum of Natural History. Original written by Natalie van Hoose. Note: Content may be edited for style and length. Related Multimedia: Images of the the microtektites Journal Reference: Mike Meyer, Peter J. Harries, Roger W. Portell. A first report of microtektites from the shell beds of southwestern Florida. Meteoritics & Planetary Science, 2019; DOI: 10.1111/maps.13299 Search withinThis JournalAnywhere Search term Christopher Meteoritics & Planetary Science Original Article A first report of microtektites from the shell beds of southwestern Florida Mike Meyer Peter J. Harries Roger W. Portell First published: 06 May 2019 https://doi.org/10.1111/maps.13299 Read the full text PDF TOOLS SHARE Saw this an thought this was pretty wild as I've been poking around in the Tamiami here in Florida for quite awhile. Abstract The Plio‐Pleistocene Upper Tamiami Formation (Pinecrest beds) of Florida is well known for its fossiliferous shell beds, but not for its extraterrestrial material. Here we report the first occurrence of tiny (~200 μm in diameter) silica‐rich microspherules from this unit and from the state. This material was analyzed using petrographic and elemental methods using energy dispersive X‐ray spectroscopy (EDS). The majority of microspherules are glassy and translucent in reflected light with some displaying “contact pairs” (equal‐sized micro‐spherules attached to each other). Broken microspherules cleave conchoidally, often with small internal spherical vesicles, but most lack any other evidence of internal features, such as layering. Using the EDS data, the microspherules were compared to volcanic rocks, microtektites, and cosmic spherules (micrometeorites). Based on their physical characteristics and elemental compositions these are likely microtektites or a closely related type of material. The high Na content in the examined material deviates significantly from the abundances usually found in micrometeorites and tektite material; this is enigmatic and requires further study. This material may be derived from a nearby previously unknown impact event; however, more material and sites are required to confirm the source of this material. Because of the focus on molluscan fossils in southwestern Florida shell beds, microtektite material has likely been overlooked in the past, and it is probable that these microspherules are in abundance elsewhere in these units and possibly throughout the region.
  3. It appears that people can find Plio‐Pleistocene microtektites associated with and inside closed clams of the Upper Tamiami Formation (Pinecrest beds) of Florida. Maybe enterprising fossil collectors and citizen scientists could look for and find microtektites in other outcrops of Pinecrest beds. The paper is: Meyer, M., Harries, P.J. and Portell, R.W., 2019. A first report of microtektites from the shell beds of southwestern Florida. Meteoritics & Planetary Science. https://onlinelibrary.wiley.com/doi/abs/10.1111/maps.13299 Blog post about micrometeorites in your house gutter Can you Really Find Micrometeorites in Your Gutter? Well... Phil Plait, Bad Astronomy. May 16, 2019 https://www.syfy.com/syfywire/can-you-really-find-micrometeorites-in-your-gutter-well Flecks of Extraterrestrial Dust, All Over the Roof The New York Times, By By William J. Broad https://www.nytimes.com/2017/03/10/science/space-dust-on-earth.html Genge, M.J., Larsen, J., Van Ginneken, M. and Suttle, M.D., 2017. An urban collection of modern-day large micrometeorites: Evidence for variations in the extraterrestrial dust flux through the Quaternary. Geology, 45(2), pp.119-122. Open access https://pubs.geoscienceworld.org/gsa/geology/article/45/2/119/195213/an-urban-collection-of-modern-day-large Yours, Paul H.
  4. Tamiami Gastropod help needed

    Hello gang, Looking for some help on what you might think these little guys are...they've been in the garage for years and recently been freed! Spoil finds from Sarasota County, Florida. APAC spoils.. Plio-Pleistocene. I had cut this Strombus in half sometime ago to look at its internal chambering and recently decided to remove the contents. To my surprise there were all kinds of things in there and I've only photographed a small number of them as they are just too small. I am very curious about what the 4 guys are just to the right of the Strombus. I've not seen something like them before. The last 2 photos on the right show a more detailed look of just one of them. The last whorl form/ornamentation that differs from the uppers is throwing me..I thought maybe they were an immature shell maybe something like Scaphella and then thought maybe it could it be a Sincola? I've got some other shells I'll be digging into as well as I'm still looking for some Ecphoras and echinoid parts and other oddities. I've got this other Strombus below that shows at least 4 other gastropod species within that shows more good promise. , I have a Panope, a Spondylus and a maybe a Marvacrassatella? that I want to open also that I've had in the garage patiently waiting there for me to get around to. To get things really moving I need to finish mixing up some butvar/acetone to add to the shells exterior as some of them are pretty flaky..my swirling project to get that stuff to dissolve is trying my patience again. Thanks for the help/looking. Regards, Chris Thanks! Regards, Chris
  5. Marine fossil...bone?

    I've been down for a little minute, but on the mend and digging again. My first outing produced this guy. I found a pocket of kaolin, which is exciting because it seems to always hold nice pieces. I was not let down. I know it still is very encrusted, and I'm trying to navigate it, please bear with me. It's about an inch. When I pulled the nugget I saw a tiny spot of black- figured I had a small tooth or scale. Started prepping it and...what the heck is it? Doesnt look like shell. Never seen anything like it. And ideas? I'm anxious to learn about it. Thanks in advance!
  6. Bivalve-enough left to ID?

    Is there enough of this guy for anyone to guess at an ID? Both valves are present, the side with the (I think...) plicatula gibbosa stuck to it is barely there, and heavily, heavily worn, but present. I've had it for quite a while, haven't found a match for it yet, but I also have no clue how much might be missing. I'm hoping the severe shelf on it will be enough for someone. Sw Fl, pliocene. Any help appreciated!
  7. Shrimpy looking thing

    I was cleaning some pieces I dug out today, and this little guy popped out of a little shell packed with sediment. I thought it would be a neat tooth or a bit of bone, but, instead it was this. Any ideas? It's only about 2.5mm, so it's pretty darn tiny. Any help on this would be super cool because I don't know where to start. Bug? Shrimp? Looks awful shrimpy to me, but I know nothing there. Could be a bug. Do modern bugs get cemented into fossils often? Or is it a fossil? Thanks in advance! (Sw FL) Florida - Tamiami Formation
  8. Stepp's Collection

    Isistius triangulus (Probst 1879) Florida (USA), Sarasota County, "Cookiecutter Creek" Site, gravel; 2018 (cf. https://www.floridamuseum.ufl.edu/index.php/download_file/view/21220/1075)
  9. Looks like a tiny egg case

    What is this? It's actually gray to the naked eye, but the lights on the microscope glare white off of it. It's about 3mm. And it looks like the tiniest egg casing. Sw fl. Popped off larger shell. 3 views. Slightly concave on one sive, like it was shrink wrapped a little too tightly (fig 3), the flip side is slightly convex, like a ravioli. The "horns" on it are pretty symmetrical.
  10. Acts of predation? Odd settling?

    Ok, don't need an ID of the oyster (probably hyotissa) or the other one, but an explaination of how they came to be how they are. Is this evidence of predatory behavior or just really weird settling? pictures are kinda large, so two posts. Hyotissa first. It has this paw print looking bit, looks bored into the shell, goes straight through to the muscle. Are there burrowing gastropods that would do that? I've only found drill holes. Also, what's with the double attachment on the bottom right of the inside?
  11. By any chance does anyone recognize these little orb/circular structures/features in some of the damaged Vermicularia tubes in these shots? Not sure if they might be simply immature bivalves or something else? I pried out a few of them and I'm no wiser as they are so small and I dont see any real features/markings under magnification... The two that I pried out are approx .5mm wide but the others still in the tubes are a bit bigger. The 2nd and third frames in the 2nd photo makes them look like something that could be a small echinoid with star shaped markings but that might be deceiving. they actually look more like absolutely smooth micro PVC endcaps, not spheres/orbs. In my other recent Garage finds thread Adam had a good question about operculums and I dont even know if they had one or not...So if you all have any insight I'd love to hear/know.. Thanks for the help. Regards, Chris
  12. For awhile now, I have been trying to pin down this scallop. I think it is an argopecten, possibly comparilis, or evergladesensis, but the images I can find on line of those, seem to show ribs that are rounded on top. These shells have very flat ribs, with a very slight indentation running down the center of each. The shells are offset a bit. I found them in the northern most edge of ochopee member of the Tamiami formation, along with euvola hemicyclica, and a really lovely little urchin test, the exact name of which I don't recall as I sit here typing. I have a collection of 30 different sizes I am trying to put together in a ryker box, but have not yet done so, because I just don't know the id...a friend suggested I check out dimarzipecten crocus....but that kind of obscure reference is wa-a-ay beyond me. I'd rather put to use someone's knowledge, if you know what it is, would you please take a moment and explain Why you i.d. it as you do. Much appreciated.
  13. Was looking at some stuff in the garage today and in the Spondylus sp. pile I had this chubby little guy. Seems to be a loner as I dont have anything else quite shaped like it...I was thinking it might be actually in Chama family but the others I have appear to be more round and this guy seems to be elongated. I cant find anything similar to it in some of the online references I looked at. Has anyone run across something similar and if its a Chama sp. know what the species is? It's got a couple of the typical clam borings and worm tubes and maybe a little Plicatula sp. attached to it as well to make it extra special. Sarasota Cnty, Florida. Plio-Pleistocene, APAC spoils, Tamiami Formation? Any help is appreciated. Thanks, Chris
  14. Hello Gang. I'm not sure if fossiling takes your focus off what you should be doing like it does me but yesterday I was supposed to be clearing an area out to make space for an upcoming wood working project. Well that exercise turned more into opening boxes and looking at fossils stored there and reliving why I had brought some of them home. It was a good thing and a bad thing! As many of you know the Tamiami formation has a boat load of invertebrate species and its fairly easy to acquire a bunch of material quickly so here are several shots to share with you all of some of the variants I've brought home over the past several years---Sarasota County, Plio-Pleistocene. There are occasionally also some pretty nice shark teeth that you can run across in the various spoil finds. Here are several of the common types I've found..Mako, Tiger, Meg and Carcharhinus sp. types... There are a number of barnacles and I'm fascinated by the different types but its the associated attachments that they are found on that really gets my eye. I believe here's a Ceratoconcha sp. group that has latched on to a good sized bone fragment and a Chesaconcavus sp. on a coral branch. I've picked up lots of damaged shells and here are two gastropods with showing what I believe are some type of shell repair. The larger one somehow survived the massive damage..I've read about how crabs have sometimes inflicted these wounds so if thats the case the crab must have been fairly good sized one. The smaller guy has some small damage near the tip of the spire and along the aperature. I'm intrigued by just general shapes and coloration differences so here's a few examples of some gastropods Neverita sp. and Chesapecten sp. that came home. The last shot is my favorite from the day...a Vasum (Hystrivasum) that has sponge boring damage, a good sized Balanus sp. growing on the spire and if you look close you can see small boring clams still in their bore holes on the top left of the specimen just beneath the barnacle. All for now. Hope you enjoy. Back to woodworking! LOL. Continued hunting success to you all! Regards, Chris
  15. Concretion guesses?

    I'm going to try to clean this off again tomorrow.. anyone have a guess? It's about 3.5cm
  16. Niveria floridana

    Niveria floridana was named by Olsson & Harbinson (1953). Although I did see someone synonymize this with the recent Niveria suffusa they did so without an explanation. N. floridana can be differentiated from N. suffusa by lacking the nodose ribs of the extant species. Reference Olsson, A.A., and A. Harbison. 1953 (1990 Reprint). Pliocene Mollusca of Southern Florida with Special Reference to Those from North Saint Petersburg, with special chapters on Turridae by W.G. Fargo and Vitinellidae and Fresh-water Mollusks by H.A. Pilsbry, The Academy of Natural Sciences of Philadelphia Monographs 8, The Shell Museum and Educational Foundation, 457 pages, 65 plates
  17. Here is my trip report originally inspired by an announcement by Fossil Beach after noticing a large pile of shell hash laden material for parking lot fill that was spotted on Bradenton Beach. For reference, here is the original posting that instigated this trip: http://www.thefossilforum.com/index.php?/topic/60966-fossil-shell-pile-at-bradenton-beach/ Kara (Khyssa) used this information to plan a (rather soggy) fossil hunting trip a couple of weeks ago when when was heading down to Tampa for a fossil club meeting. Her trip report (and her wonderful finds) is available through this link: http://www.thefossilforum.com/index.php?/topic/61170-fossil-shells/ Through this forum, the source of the material in this pile was determined to likely be from SMR Aggregates of Sarasota. Jack (Shellseeker) had provided a great document from the Southeastern Geological Society (SEGS) that provided a great insight into the Pinecrest Beds of the Tamiami Formation that are very biodiverse in terms of shelled mollusks (over 1000 species recorded). For convenience, I'll repeat that link here as well: http://segs.org/wp/wp-content/uploads/2010/01/SEGS-Guidebook-No-56.pdf And now onto the trip report itself. My mother was in town visiting for a couple of weeks from the chillier latitudes of the Chicagoland area. She had planned spending the last week of her trip over on Sanibel Island on the gulf coast of Florida. A friend of hers had rented a condo there for a month and she figured she'd chill-out Sanibel style for the last part of her trip. Rather than making the 3-hour trip to Sanibel to drop her and return on the same day, I was looking for something else to do on this roadtrip. We earlier had considered stopping at the Peace River and doing some fossil hunting on the return leg of the trip but this year the river flatly refuses to drop to a huntable level. We made a quick stop at the boat ramp in Arcadia to show my mom what the Peace River looks like (albeit in flood stage) so she can better picture what it looks like since I've told her many stories about past fossil hunting trips on that river. This is what it looked like when we passed through Arcardia--not quite ready for prime time yet. We continued west and soon arrived at Bradenton just in time to meet Pete for lunch. He's an ex-coworker of my wife's who was in Florida doing the snowbird thing. Post lunch we drove the final few miles to the bridge crossing over to Bradenton Beach (and the bumper-to-bumper traffic--and it's not even high-season). With the great intel provided by Fossil Beach we quickly spotted the shell pile and remarkably found parking spaces nearby on the beach side. We crossed over the street and noticed that in the lot where the big shell pile was dumped that there was a police car parked in the shade of the nearby trees. I walked over to the car and asked the officer if there was any problem with us scrummaging around in the pile to look for some fossil sea shells. His words were, "Knock yourself out." I joked that I hoped to be a bit more careful than that but he missed my dry sense of humor and stated that it was only a figure of speech meaning to do as I like. I smiled and thanked him taking his response taking it as tacit approval that he had no issues with us collecting shells before they are plowed into a crunchy mess in some nearby parking area. We walked over to the pile and immediately saw the incredible density of shell hash in this paving material. As expected, much of the material was hopelessly crushed and broken given its less than gentle handling from its origin to this pile. With a little bit of searching (and sometimes with the aid of a poking stick--a screwdriver would have been a good idea) we started to find some nice shells that were still intact. We walked around the pile and up one side to a little caldera like valley that had formed at the top. You can see in the last photo below from the top of the pile the steady line of traffic just a short distance from the pile.
  18. Florida Echinoid Help Needed

    Hey Gang, Started trying to put away some more of the stuff in the garage and ran across an echy in matrix that I found and had dismissed as unidentifable as it had this encrustation that I just couldnt seem to remove at the time....Well been playing it with most of the day I now see a majority of the test is there and I was thinking it looks like a Schizaster...wondering what you all think? Anyone have any similar finds from Sarasota County? All I could find that seemed close was a Eocene Schizaster from the Ocala Limestone. I am working in APAC spoil piles in Sarasota County and its all Plio-Pleistocene there so that presents a dilemma if its S.armiger (Clark) as that seems to be much older in age .... this seems to be heart shaped but almost round 2.9cm long X 2.7cm w and 2.5 cm tall. Also looks maybe more similar to an Eocene Schizaster ocalanus listed in the Florida MNH Galleries specimen 183665 but I'm just guessing...orafice positions look closer than the Agassizia's pictured in the gallery that are of early Pleistocene age (and coincidentally from the Caloosahatchee which is present at the site) and are similar in overall test shape. http://www.flmnh.ufl.edu/invertpaleo/display.asp?catalog_number=183665&gallery_type=Florida%20Echinoidea Any help is appreciated. Edit: added dimensions and photos/comments about S.ocalanus. Regards, Chris
  19. Small Shells From Smr

    I love taking these trips to SMR Aggragates for 2+ MYA shells and an occasional vertebra fossil, Not a lot of time , lots of rain water around, and mostly smaller fossil shells, This was last Sunday and I also spent National Fossil Day helping out at the South Florida Museum on Saturday, When the Peace River is out of season, I look for hunting where ever I can. This pretty little Mako came my way on Saturday and some nice shells on Sunday. SMR is always rewarding. I have a bunch of larger shells to clean and sort. That can be fun also with a lot of matrix mixture inside the bigger shells. Enjoy, Shellseeker
  20. More Florida Marine Shells

    A couple of weeks ago, I posted a topic asking for help with some mollusk IDs. MikeR kindly identified them for me, and suggested that they were from the Upper Pliocene Pinecrest Beds of the Tamiami Formation. Today I'm posting the rest of that batch of fossils. These were collected from the same site as the last bunch. This time, I have an idea of what they might be, I'm largely looking for confirmation or correction. My IDs are based entirely on the Florida Museum of Natural History image galleries online. All scales are centimeters, with half-cm marks. First, a conch. Is this Melongena corona? Second, a murex. Phyllonotus globosus? Third, a miter shell. Pleioptygma ronaldsmithi? Fourth, a wentletrap. Pyrazus scalatus? Fifth, a thorny oyster. Arcinella cornuta? I have several more that I'll post in the comments.
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