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  • Stratigraphic Succession of Chesapecten

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  1. Hi all, I recently returned from spending a few days searching the beach of Tybee Island, Georgia, and found something I am unsure as to what it is. From reading online it looks like the age could be anywhere from Miocene to present. My initial gut is some sort of vertebra. Please let me know if any other photos or information would be helpful. Thank you!
  2. Abonanni

    What is this bone?

    Found these 2 matching partial bones in the same location. I’m confident they are bones, but unsure of their origin. This site is known for Pleistocene fossils. Savannah, GA. Savannah River. Shark Tooth Island.
  3. Abonanni

    What is this thing?!?

    Found this unique looking bone but can’t pinpoint an ID. I’ve seen similar bones on pictures of Giant Ground Sloths but the back of the one I have isn’t quite as curved. I’m definitely thinking it’s a part of a finger or toe.
  4. Abonanni

    ID help please!

    Found on dredge island off of Savannah River.
  5. Recently, two collectors who scuba dive for fossils throughout Florida and Georgia have recovered 5 chesapecten (including two paired valves) with morphological characteristics that signal a Miocene age. These characteristics include an acute byssal notch and a depressed byssal fasciole that is strongly differentiated from the shell’s auricle in terms of sculpture and elevation. The largest of the adult shells also displays an active ctenolium and one of the paired specimens displays significant gapes between valves when matched (the other pair was preserved as found by glue according to the collector and cannot be matched). Both of these aforementioned traits are also emblatic of Miocene age for Chesapecten. These shells were recovered from the following areas in Georgia and Florida: Savannah River, Effingham County, Georgia (Collector 1) Specimen 1 (W = 108.0 mm) R valve L valve R valve - close up of byssal notch and fasciole (most of fasciole has been degraded) R valve - close up of ornamentation L valve - close up of ornamentation Profile Close up of matrix, gray sand Savannah River, Effingham County, Georgia (Collector 1) Specimen 2 (W = 101.6 mm) R valve R valve - interior R valve - close up of byssal notch and fasciole L valve - note barnacles are modern species, not fossilized L valve - interior L valve - close up of ornamentation on auricle Side profile of pair, showing gapes Front profile of pair, showing gapes Cumberland Island, Camden County Georgia (Collector 2) Specimen 3 (W = 114.3 mm) R valve, note encrustation is recent not fossilized R valve interior, thick shell apparent Close up of byssal notch and fasciole Close up of ctenolium, although modern encrustation makes it difficult to see what is going on Close up of ornamentation St Mary’s River, Nassau County, Florida (Collector 2) Specimen 4 (W = 117.5 mm) R Valve R valve interior, active ctenolium and thick shell apparent Byssal notch and fasciole Close up of original sediment, note the olive and gray coloration Profile Suwanee River, Hamilton County, Florida (Collector 2) Specimen 5 (W = 69.9 mm) R valve, subadult specimen R valve interior, shell is thick for a subadult Of the Miocene strata from Coastal Georgia and NE Florida currently described in the literature, the Ebenezer Formation of Weems and Edwards (2001) of Upper Miocene Tortonian age appears to be the most suitable match for these chesapecten. The Ebenezer was originally defined by Huddleston (1988) as a member of the Coosawhatchie Formation (Middle Miocene). Weems and Edwards later elevated it to formational rank based on differences in lithological and dinoflagellate composition compared to the rest of the Coosawhatchie. The Ebenezer formation consists of gray to olive-gray, fine- to medium-grained micaceous sand and stretches from South Carolina to NE Florida. Five mappable members are apparent and separable by distinct unconformities. The lower four members correspond to dinoflagellate zone DN 8, while the uppermost member corresponds to DN 9. Revision of the Ebenezer to Formational Rank from Weems and Edwards (2001) According to the dinoflagellate zonation of de Verteuil and Norris (1996), DN 8-9 aligns with the Little Cove Point Member (DN 8) and the Windmill Point Member (DN 9) of the St Mary’s Formation of Maryland and Virginia. Alignment of the Ebenezer to St Mary's Formation of MD and VA from Weems, Self-Trail and Edwards (2004) Notably, no other Chesapecten in this age range outside of Maryland and Virginia has been reported in the literature. All specimens display similar characteristics which include an acute byssal notch, differentiated byssal fasciole, slightly inflated right valve, and a hinge size in adult specimens that is relatively small for adult chesapecten with the exception of Chesapecten covepointensis (DN 8 St Mary’s Formation) and in some cases Chesapecten santamaria (DN 9 St Mary’s Formation). However, it appears that these shells can be divided into two distinct variants although the preservation appears to be somewhat better outside the Savannah River region and may exaggerate these differences. Nevertheless, the Chesapecten collected outside of the Savannah River Region exhibit stronger, more raised ribs and have thicker, heavier shells compared to the specimens collected within the Savannah River region whose shells are thinner and ribs are lower and less pronounced. This is especially true of Specimen 1. It is possible that these variants originate from different members of the Ebenezer Formation. According to Weems and Edwards, “outside of the Savannah region, beds no older than dinoflagellate zone DN 9 occur”. This suggests that the shells collected outside of the Savannah River Region likely belong to Bed 5 of the Ebenezer Formation. Figure 3 of Weems and Edwards (2001) [shown below] suggests that someone scuba diving for fossils in the Savannah River is likely to collect in Bed 4. Therefore, it is possible that the Chesapecten specimens recovered from the Savannah River belong to Bed 4 of the Ebenezer Formation. This stratigraphic information aligns with the observed morphological differences among the specimens and tentatively supports the significance of these variations. Needless to say, more specimens are needed to confirm. Lateral Gradation of the Ebenezer from Georgia to Florida - Fig. 3 from Weems and Edwards (2001) Ward (1992) has remarked that the period between Chesapecten santamaria (DN 9) and Chesapecten middlesexensis (DN 10) represents a considerable loss of the fossil record in the stratigraphic succession of chesapecten. These Chesapecten, which bear a strong overall resemblance to Chesapecten middlesexensis while displaying traits of preceding species (smaller hinge, more differentiated byssal fasicole), could help bridge this apparent gap. Personal Remarks The equivalency of these shells to the St Mary’s Formation, not the Eastover formation is surprising to me given the strong resemblance to C. middlesexensis. If anyone knows of any findings correlating DN 8-9 to the Eastover, or of the Ebenezer to DN 10 please let me know. Also, if anyone has any additional samples of similar shells from similar sites, even in SC please let me know. Thank you! References de Verteuil, L., and Norris, G., 1996, Miocene dinoflagellate stratigraphy and systematics of Maryland and Virginia: Micropaleontology, vol. 42 (Supplement), 172 p. Huddlestun, P.F., 1988, A revision of the lithostratigraphic units of the coastal plain of Georgia; the Miocene through the Holocene: Georgia Geologic Survey Bulletin, no. 104, 162 p. Ward, L.W, 1992, Molluscan biostratigraphy of the Miocene, Middle Atlantic Coastal Plain of North America, VMNH Memoirs, no 2, 152p. Weems, R.E, Edwards, L.E., 2001, Geology of Oligocene, Miocene, and younger deposits in the Coastal Area of Georgia: U.S. Geological Survey, no 131, 129 p. Weems, R.E, Self-Trail J., Edwards, L.E., 2004, Supergroup stratigraphy of the Atlantic and Gulf Coastal Plains (Middle? Jurassic through Holocene, eastern North America): Southeastern Geology, volume 42, p 191-216
  6. Looking for help identifying these 4 fossils. I have received multiple suggestions so I am turning to the experts. Thought is the first is 1. Vertebrae (2”), 2. Sperm whale tooth, 3. Ankle bone but from what? (2”) 4. Marine due to porous nature.
  7. Lecyadventurers

    Fossils or just shell and rock

    Hey everyone, new here, but hoping I’ve come to the right place! My family just got back from tooth hunting on shark tooth island and found these too and wondered how we could confirm what they are and if they’re just ordinary or could be extraordinary!
  8. Bhammer

    Name that Fossil

    Anyone have a clue? Found in Savannah River dredge tailings near Savannah, Ga. I have had many look at this piece & so far no one has been able to identify - approx size 2” x 1” in.
  9. jbenn57

    Mystery Bone

    I found what appears to be some sort of bone while on Shark Tooth Island off the in the Bull River/Savannah River in Georgia. Does anyone have any insight into what this may come from? Horse, or some sort of cetacean?
  10. Hello! Can anyone help me identify this bone I collected on a beach at the Savannah River in the area known for dredging? It appears to be an animal femur. I’m new to fossils - can’t tell if this could be a really cool find or just the bone of a large processed animal as another suggested. I appreciated the help.
  11. jameshammond

    Large Bone Fragment, Maybe Rib Bone?

    Found near the Savannah River, I was thinking it looks like it could be a rib or shin bone. Does anybody have any idea what it could be?
  12. HHIguy

    Savannah River Fossil ID

    Hi all! This is my first time posting here, so hoping to have one of you help with ID on a fossil I found in a spoil spot on the Savannah River. These are dredged spots used to deepen the Savannah River for large cargo ships. After doing some digging here on the fossil forum I stumbled on a whale teeth diagram that seem pretty similar to what I’ve found. Thanks all for your help in advance.
  13. Brett Breakin' Rocks

    Carcharhinus sp. 03

    From the album: Sharks and their prey ....

    Carcharhinus sp. Savannah, Georgia

    © © Matthew Brett Rutland

  14. Brett Breakin' Rocks

    Galeocerdo sp. 03

    From the album: Sharks and their prey ....

    Galeocerdo sp. Savannah River, Pliocene Savannah, GA

    © © Matthew Brett Rutland

  15. Brett Breakin' Rocks

    Galeocerdo sp. 02

    From the album: Sharks and their prey ....

    Galeocerdo sp. Savannah River, Pliocene Savannah, GA

    © © Matthew Brett Rutland

  16. Dawghouse05

    Two teeth ... maybe ? Ideas ?

    Found several fossils this morning shark tooth hunting on the beach and was hoping y’all might could tell me what they might be , thanks !
  17. Aim

    Bone from what?

    What bone is this and from what ? Found on dredge spoil beach on Savannah River in Georgia
  18. Dawghouse05

    Find on Tybee Island

    Can anyone guide me in the right direction on this find please ? I’ve got a few others to post as well . Many thanks in advance , John
  19. On Wednesday, relatives have invited me to accompany them to Shell Bluff along the Savannah River, home to the Dry Branch formation which is late Eocene (approx. 38 MYA) in age. This formation is home of an oyster bed, but not just any old oysters: Enter Crassostrea Gigantissima, a YUGE prehistoric Oyster that can grow a whopping 20 inches long. That's almost as long as my forearm! So how much do you guys know about these behemoths?
  20. Jz245

    What the heck is this?

    My wife got me into tooth hunting and after several years visiting coastal beaches in South Carolina and Georgia we set our sights on bigger finds. Over the past few months we have been going to the Savannah River with numerous finds like Megs, giant makos, great whites, pygmy sperm whale teeth and unidentifiable bone fragments. Looking forward to help from the group from time to time. Attached is One of Saturday a finds. any idea what it is?
  21. Brett Breakin' Rocks

    Odontocetes 02

    From the album: Sharks and their prey ....

    Delphinid Dolphin Tooth Savannah River Savannah, Georgia

    © Matthew Brett Rutland

  22. Brett Breakin' Rocks

    Carcharhinus sp. 03

    From the album: Sharks and their prey ....

    Carcharhinus and Galeocerdo sp. Savannah River Savannah, Georgia

    © Matthew Brett Rutland

  23. Brett Breakin' Rocks

    Carcharias sp. 01

    From the album: Sharks and their prey ....

    Carcharias sp. Savannah River Savannah, Georgia

    © Matthew Brett Rutland

  24. Brett Breakin' Rocks

    Chubutensis or Megalodon ?

    Hello Everyone, Something that has always confused me ... teeth like this. This was a tooth pulled from Savannah River dredge material. I can't confirm the formations but the dredge worked the river to 47foot depth. I've read in some spots that the material could possibly be as old as Miocene. My assumption when I am hunting is Pliocene to Pleistocene. Is this just a juvenile meg tooth with cusps or a chubutensis tooth ? Should the cusps be more integrated into the blade ? 2 inches on the slant. Anyhoo ... an outlier to the teeth that I normally find which are solidly in the megalodon camp. At least from a morphological standpoint. @Al Dente Have you seen chubs pulled out of the river ? Thanks, Brett
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