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Showing results for tags 'Georgian Bay formation'.
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Hello everyone! Now that I've started to split some rocks from my local creeks (Mimico Creek and Etobicoke Creek, Georgian Bay Formation, Upper Ordovician), I'd like some help to identify what I've found. @JUAN EMMANUEL, can you help? Rock #1: This type of bivalve is very common, but I can't decide if it's Ambonychia sp. or Byssonychia sp. The book I have says that they both occur in the Georgian Bay Formation, and they look very similar except Byssonychia sp. "has strong radiating ribs rather than (fine radiating) striae," which is what Ambonychia sp. has. (Hessin, p. 148) What do you think? Rock #2: I've started to find this type of bivalve quite frequently. It looks like the pictures of Cymatonota sp. in the book that I have (Hessin, p. 145), but I'm not sure if this genus exists in the Georgian Bay Formation since Hessin states that "it is moderately common in the Verulam and Coburg formations" (p. 145) but he makes no mention of it occurring in the Georgian Bay Formation. Hessin does state that another similar-looking bivalve can be found in the Georgian Bay Formation: Colpomya sp. (p. 146), so perhaps it could be that? Hessin also discusses a bivalve community that is commonly found in the Georgian Bay Formation that consists of Ambonychia/Byssonychia and Modiolopsis (p. 52), so could this be Modiolopsis sp. instead? As you'll see in Rock #3, the bivalves in Rock #1 and Rock #2 are often found together. Rock #3: "front" - bivalve community, but which genera? Rock #3: "back" - bivalve community (which genera?) along with a couple of brachiopods (I think). It may be a bit too difficult to identify the brachiopods, but I'm hoping that someone out there might be able to - perhaps Onniella sp. or Strophomena sp. for the one on top (positive and negative)? Rock #4: positive and negative of a brachiopod - again, it may be too faint to identify but I'll keep my fingers crossed that someone can help me. Maybe Dalmanella sp. or Paucicrura sp. or Resserella sp.? Thanks everyone! Monica
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From the album: Finds From the Ordovician -488 to 443 MYA-
From the Georgian Bay Formation -
Yesterday I visited Etobicoke creek (west end of Toronto) which exposes the ordovician Georgian Bay formation. The creek was abundant with trace fossils and plates of preserved ripples, as well as small orthocone nautiloids.
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Hello there! I was inspired by @markjw to check out the Credit River here in Mississauga, Ontario (Georgian Bay Formation, Upper Ordovician) because where I normally hunt there are typically no corals and I'd love to add a couple to my collection. Consequently, I went out for about an hour this morning before the family got up in order to try my luck, and I'm happy to say that I was successful!!! Based on information provided by @FossilDAWG in other threads here on TFF, I think all of my colonial rugose corals are Favistina calcina - here are photos of three of my specimens: Specimen #1 - side view: Specimen #2 - top and bottom views: Specimen #3 - top and bottom views: more to come...
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Hello there! Well, I tried to take Viola out for a little fossil hunt by Mimico Creek in Etobicoke, Ontario (Georgian Bay Formation, Upper Ordovician) this afternoon because when I checked the forecast this morning it looked like it was going to be ideal fossil-hunting weather - a mix of sun and cloud with temperatures in the mid-20s Celsius. When we arrived, however, it began to rain - we toughed it out and came away with one piece before it began to pour and we called it a day. I was disappointed since I was hoping to spend a few hours there, but the one piece we took home looks like it might have a graptolite on it, which is quite exciting since I have yet to find one in my local haunts. Please check out the photo below and let me know what you think: Thanks in advance for your help! Monica
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So many Georgian Bay fossils recently...can't keep up with cleaning
markjw posted a topic in Paleo Re-creations
If I had 2 weeks of vacation, I still wouldn't be able to catch up with cleaning, identifying, sketching, photographing, and organizing the recent minor finds.
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Treptoceras crebiseptum (Hall, 1847). A nautiloid found in the shale of the Georgian Bay Formation, lower informal member, at a shale wall. Locality is Mimico Creek, Etobicoke, Ontario, Canada. I have included in situ pics to show the process of collecting the specimen. The length of the orthocone is approximately 40 cm which is the size of an adult Treptoceras crebiseptum.
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Hello everyone! On Monday, I found a beautiful Treptoceras crebriseptum orthoconic nautiloid in a huge rock at Mimico Creek in the Etobicoke/Toronto area (Georgian Bay Formation, Upper Ordovician). It has been suggested that I might have a complete specimen, so I was hoping that someone out there might be able to let me know if this is the case or not. Here are some pictures... Whole specimen: Close-up of the base of the specimen (specimen has been turned over) - note that it is smoothly rounded and shows no septa - is this the fossilized living chamber of the animal? Close up of the tip of the specimen - note that it seems to end before the rock edge - is this the very tip of the animal? Close up of the piece that shattered off the tip of the specimen - note that it also seems to end before the rock edge: Thanks for your help!!! Monica
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Conularia formosa (Miller and Dyer, 1878). Specimen with a positive and a negative counterpart (matrix). Found while smashing a limestone layer at Mimico Creek, Toronto, Ontario. The matrix of the Conularia has the negative on it, as well as bryozoan bits. Bibliography: Ontario. Department of Mines. The Stratigraphy And Paleontology Of Toronto And Vicinity.
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crinoid stem, ichnofossils, and maybe a hyolith at Etobicoke Creek?
Monica posted a topic in Fossil ID
Hi all! Yesterday afternoon I visited my local haunt (Etobicoke Creek, Georgian Bay Formation, Upper Ordovician) with the kids, and I found a few items that I'd like to show you: Item #1: long crinoid stem - any ideas as to its identity? Item #2: big piece with ichnofossils - item circled in yellow is ichnofossil "a" and item circled in orange is ichnofossil "b" Item #2a: ichnofossil "a" top view Item #2: ichnofossil "b" top view Item #2: ichnofossil "b" side view Item #3 top: two views of a mineral stain that has the shape of a hyolith - what do you think? Item #3 bottom: crinoid columnal impressions (I think!) so it is fossiliferous rock (I think!) so perhaps the specimen above could've been a hyolith??? Thanks as usual for your help! Monica
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Yesterday the weather in my area hit above the 20 degrees Celsius so I dared myself to go to Streetsville in Mississauga to visit a fossil site I have not been to in 2 years. I now live in Hamilton, Ontario so travelling to Streetsville was intimidating for me using public transit from Hamilton to Streetsville. I have not been to Streetsville by the Credit River ever since I moved from Etobicoke to Hamilton, Ontario and I miss collecting in this vicinity. But I made it. :)) I took pics of exposure sites as these sites are mentioned in one of the literatures describing the Georgian Bay formation. This site exposes the Georgian Bay formation, Upper Member.
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Hello again! The weather was warmer today, and since I had the kids to myself all afternoon while my husband went to see a movie with a friend, I decided to take the kids out once again. We first tried to do some collecting at Mimico Creek but were unable to because (1) the water was running too high, and (2) they've been doing some construction work around there which prevents us from getting close to our hunting spot. So the kids played at a nearby park for a while, and when I suggested that we check out Etobicoke Creek again, they were all for it (even William!). There was no ice this time, thank goodness, and what follows are just a few pictures of what I found - enjoy! I hope you're all having a wonderful holiday! Monica Orthoconic nautiloid (Treptoceras crebriseptum) chunk: Bivalve (Ambonychia radiata): Brachiopod (Sowerbyella sericea) positive and negative - the positive is just under 2cm long at the hinge line while the negative is just over 2cm at the hinge line (I'll tag @Tidgy's Dad just because I know how much he loves brachiopods ): Viola showing off one of her finds (another T. crebriseptum) with William joining in on the photo:
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- etobicoke creek
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Hi guys so I have this Hebertella occidentalis specimen I collected yesterday from the Credit River at Streetsville, Mississauga, Ontario, which belongs to the Upper Member of the Georgian Bay Formation. Do these look like predation marks? There are also what appears to some crystallized grains inside these marks and I think they could be some sort of calcite. Sorry for the noisy grain of the image, but I hope this will help.
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Some Streetsville Specimens from Mississauga
JUAN EMMANUEL posted a topic in Member-to-Member Fossil Trades
Hello guys. I’ve got 2 Late Ordovician reef fossils from Streetsville, Mississauga, Ontario, Canada that I’d like to trade away to make room now that the fossil hunting season is coming back soon. I am trading away the specimens below. These are very nice specimens and comes from an exposure out of access to the ordinary public. Both belong to the Upper Member of the Georgian Bay Formation. Favistina calicina: Stromatocerium huronense:
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A brachiopod that occurs in the Humber Member of the Georgian Bay formation. The species has a sulcus that distinguishes it from the other anazygid brachiopods of the member. Reference: Ontario. Department of Mines. The Stratigraphy And Paleontology Of Toronto And Vicinity.
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- georgian bay formation
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Hi all! I decided to take the kids for a quick hunt at our local spot along Etobicoke Creek before going to see "Mary Poppins" in the afternoon - enjoy the photos (and enjoy the fact that you weren't out there with us - it was SO cold!!!). The rocks in this area are from the Georgian Bay Formation and are from the Upper Ordovician. Monica The kids spent more time breaking ice with rocks than actually fossil hunting (some of the chunks of ice were quite thick!!!): Viola did take some time away from her ice-breaking duties to check for fossils - she found a cute little orthoconic nautiloid: I also found a small chunk of orthoconic nautiloid with the siphuncle visible: I found two pretty nice crinoid stems for my area as well: Additionally, I found a nice chunk of rock with some ichnofossils in it - any ideas as to what made them? Perhaps @abyssunder and/or @piranha and/or @JUAN EMMANUEL can chime in... Finally, I found a rock with some interesting stuff going on within it such as some brachiopod imprints and what appears to be a tabulate coral. This is interesting because I don't think tabulate corals are found in the Georgian Bay Formation - I guess it's a traveler? Any ideas as to the identities of the specimens in the rock, or are they too water worn? Maybe @Tidgy's Dad and/or @Peat Burns can help... Photo of the interesting rock in situ: Brachiopod imprint photo #1: Brachiopod imprint photo #2: Tabulate coral photo:
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I was reading a book about fossil fishes and there was a chapter dedicated to sharks and their cousins. Apparently there were chondricthyan scales found in the Late Ordovician and Early Silurian rocks. Since I hunt the Late Ordovician Georgian Bay formation in Toronto, Ontario and various Early Silurian formations in Hamilton, Ontario, what are the chances of me coming across these scales? Should I keep my eyes open and what should I look for?
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I've received a couple nice Upper Ordovician additions to my collection courtesy of @JUAN EMMANUEL and I'm finally posting them now... (Thanks Juan!) First, is this Tentaculites or Cornulites? I wish I could get better pics. Manitoulin Fm, Hamilton, ON.
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Hi guys, I visited Mimico Creek 2 days after the Canadian Thanksgiving this October which also happened to be a really hot day, which was perfect for exploring. During my time hunting the Georgian Bay Formation of Toronto I would come across these exposures that look “folded”. Does anyone happen to know as to what this really is? Here is a pic I took on that trip I mentioned to show as an example. I would find the same distortion in other parts of Toronto, not just in Mimico Creek, but also in places like along the Humber River and Etobicoke Creek.
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From the album: Urban Fossils of Toronto (Georgian Bay Formation, Lower Member)
Rusophycus osgoodii (author unknown). Found in the Humber River area, Etobicoke, Toronto, Ontario. Georgian Bay formation, Lower Member. Late Ordovician. Trilobite burrow on a limestone with other trace fossils. Dime shown to show approximate size. -
correction for name of nautiloid from the Georgian Bay Formation
Monica posted a topic in General Fossil Discussion
Hello everyone, especially those to whom I have sent chunks of Georgian Bay Formation (Upper Ordovician) orthoconic nautiloids! @JohnBrewer @minnbuckeye @WhodamanHD @VTinNorthAB @Kasia @cheney416 @David in Japan @thelivingdead531 @Tidgy's Dad @Ludwigia @joshuajbelanger Eric, I don't think I sent you any, but just in case... @Wrangellian @DLB - I don't think I sent you any, either, but - again - just in case... (By the way - do you need/want any more fossils for your boys?) I think I've been spelling the name of the orthoconic nautiloid incorrectly!!! I've been spelling it as Treptoceras crebiseptum BUT I've been omitting the "r" that's supposed to come after the "b" in the species name SO the correct spelling should be Treptoceras crebriseptum. I'm SO sorry for the error - I hope you can all forgive me Thanks, Monica- 12 replies
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Hello there! Since the kids are in day camps this week, and my husband was going to see a movie with his friend this afternoon, I took advantage of the available me-time and went for a little fossil hunt at Etobicoke Creek in Mississauga, Ontario (Georgian Bay Formation, Upper Ordovician). I have some ideas about what I've found, but I'd like your opinions, too: Specimen #1: trilobite resting place (Rusophycus, probably made by a Flexicalymene) Specimen #2: I think this is the monoplacophoran Cyrtolites ornatus - it was very flaky and some pieces fell off, but I tried to glue together the larger pieces Specimen #3: brachiopod positive and negative, but the question is which brachiopod? Thanks in advance for your help! Monica
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Hello there! Yesterday, Roger @Ludwigia dropped by for a visit, and we spent the day together checking out my local haunts with Viola. The day started with some coffee and brownies, as well as lovely German gifts from Roger: a Macrocephalites sp. ammonite for Viola (I don't have a picture of it because it's up in her room) and a Brasilia bradfordensis ammonite with a hitchhiking bivalve on the back of the matrix for me!!! See pictures below: We then piled into my car and drove to our first spot: Mimico Creek in Toronto. The fossils here are from the Georgian Bay Formation (Upper Ordovician). Here's a picture of Roger and Viola checking out the site... And one of Roger wielding his hammer... Since I'm still nursing my "fossil elbow", I didn't want to hammer anything; instead, I scraped into the wall of rock and I'm happy to say that I found a couple of sweet little bivalves: one with its two valves partly open (too bad that it's not complete) and another one with some nice ornamentation visible on its shell... @Wrangellian - what do you think? Roger did a little exploring and found some fossiliferous rock further up the wall - I collected two fairly big pieces of this type of rock and, lo and behold, they contained a bunch of brachiopods and their imprints (along with some other goodies)... @Tidgy's Dad - I thought you might like to see them
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Hello all! I was lucky enough to spend the afternoon today in the warm-but-not-too-hot sunshine at Mimico Creek in Toronto, ON (Georgian Bay Formation, Upper Ordovician), and I have a couple of things that I'd like you to have a look at: Picture #1: A view of Mimico Creek Pictures #2 and #3: A bivalve and a possible graptolite - what do you think? Pictures #4 and #5: An ichnofossil - do you think it could be Cruziana, or is it something else? Thanks so much for your help!!! Monica
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From the album: Urban Fossils of Toronto (Georgian Bay Formation, Lower Member)
Flexicalymene granulosa, Mimico creek, Toronto, Ontario. Georgian Bay formation, late Ordovician. Complete specimen still embedded in the shale. Will need prep work to be exposed. I found this one at a collapsed cliff of shale at Mimico creek. I found some flexi's this summer at Mimico creek but usually whole specimens start crumbling apart the moment I try removing the matrix around the specimens.© (©)
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