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From the album: Credit River Fossils from Streetsville, Ontario (Georgian Bay Formation, Upper Member)
Favistina calicina coral from the Credit River near Streetsville, Mississauga. Georgian Bay Formation, Streetsville Member, late Ordovician. Found as a loose specimen by the banks of the Credit River. This colonial rugose coral is very abundant along the site with many small loose colonies. Some colonies can be found on a limestone matrix. Please click on image sizes to see details of the corallites.-
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From the album: Credit River Fossils from Streetsville, Ontario (Georgian Bay Formation, Upper Member)
Favistina calicina Found as a loose specimen at an exposure at the Credit River on Streetsville, Mississauga, Ontario. Late Ordovician, Georgian Bay formation. A rugose colonial coral. Coral approximately 10 cm excluding extra matrix.- 1 comment
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New hunting location at Etobicoke Creek (Georgian Bay Formation)!
Monica posted a topic in Fossil Hunting Trips
Hi everyone! The last few times I went out fossil hunting, I tried to find new exposures along Mimico Creek in Toronto. All of these trips were unsuccessful, so I thought I'd try to find a new site along Etobicoke Creek instead. Today I checked out a new location and fossils were found - hooray!!! Here are some photos of what I found: (note that all of these fossils are from the Upper Ordovician Georgian Bay Formation) First, the trilobite pieces (@piranha - please let me know if I've identified them correctly - thank you! ): Isotelus maximus: cephalon (with a nice Ambonychia radiata bivalve next to it) and a chunk of thorax (circled in red) Flexicalymene granulosa: 2 cephala (one is quite large and the other (if it is a F. granulosa cephalon - I'm not sure if it is) is small and is circled in red), 2 pygidia (circled in red), and 1 slice through a thorax (circled in red): More to come...- 41 replies
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So I have been looking at my collection and it baffles me whether these two specimens are the same species with just different growth forms due to their deposition environments or are they entirely different species from each other? These stromatoporoids both come from the same locality (Streetsville, Mississauga, Ontario) in the Upper Member of the Georgian Bay formation, late Ordovician. Can anyone provide me with any PDF on late Ordovician stromatoporoids so I can nail down the differences between Stromatocerium and Labechhia? On the site where I collected these, I have also found mounding round stomatoporoids ranging around 4 inches to over 1 ft in diametre. I think this must be Stromatocerium. With the stromatoporoid with the prominent mamelons I have found it encrusting Prismostylus sp. specimens on the locality (what an odd association). This stromatoporoid, from my experience with the locality, usually just grows over the size of an open hand. Is this Labechia, the one with prominent mamelons?
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Hi everyone! I found this piece yesterday at my new spot along Etobicoke Creek here in Mississauga, Ontario (Georgian Bay Formation, Upper Ordovician). It's a bryozoan of some sort with some crinoid stems on it, along with an imprint that I think is either a Cruziana ichnofossil or a weathered crinoid stem imprint - what do you all think? I've boxed the imprint in red. Thanks in advance! Monica Views of the imprint: View of the other side of the rock/bryozoan: Close-up of the bryozoan:
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An unknown item from Etobicoke Creek (Upper Ordovician) and a shiny item
Monica posted a topic in Fossil ID
Hello once again! Upon closer examination of some items I recently collected from Etobicoke Creek in Mississauga, Ontario (Georgian Bay Formation, Upper Ordovician), I have found a couple of items I'd like your thoughts on. Item #1: Found on the same rock as a monoplacophoran (Cyrtolites ornatus), the unknown item is tucked underneath some matrix: View of the whole rock: Close-ups of the unknown item: Continued...- 2 replies
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From the album: Credit River Fossils from Streetsville, Ontario (Georgian Bay Formation, Upper Member)
Favistina calicina (AKA Favistella alveolata) (Nicholson, 1875). Late Ordovician, Katian. Georgian Bay Formation, Upper Member. Credit River, Streetsville, Mississauga, Ontario, Canada. Found as a loose specimen on an exposure along the Credit River. Set on fossiliferous limestone.- 1 comment
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Unknown item (sponge?) from the Credit River in Mississauga, Ontario
Monica posted a topic in Fossil ID
Hello there! Last month, I visited the Credit River in Mississauga, Ontario, Canada (Georgian Bay Formation, Upper Ordovician) to look for some fossilized corals. In addition to a bunch of weathered colonial rugose corals, I found an item that I think is something, but I'm not sure what - perhaps a sponge? Here are some photos of it: Side view - dry: Top view - dry: Top view - wet: Thanks so much! Monica- 10 replies
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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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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.- 4 replies
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I visited Etobicoke Creek, and, as usual, the place was packed with fossils. Then I went to Credit River...a park near "The Riverwood Conservancy". At first I was disappointed, but in one place I found 3 little corals that had been packed into a mud path by hiker's boots. Here they are; all approximately 4 cm across.
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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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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:- 1 reply
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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, I want to put together some pics of some of the reef material that I have found in Streetsville, Mississauga, Ontario on the banks of the Credit River. It is now winter and I am missing the warm days in which I can go and wade in the warm waters of the river for fun. I just want to compile and share some specimens that whose photos I have not shared with. All the fossils belong to the Georgian Bay formation, Upper Member, which is late Ordovician in age. First is the common coral that displays an enormity of growth forms, Favistella alveolata (Goldfuss, 1826).
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From the album: Credit River Fossils from Streetsville, Ontario (Georgian Bay Formation, Upper Member)
Homotrypa sp. (streetsvillensis?, Dyer, 1925) Georgian Bay formation, late Ordovician. Plate of unidentifiable bryozoa. Found as a loose specimen on an exposure on the Credit River at Streetsville, Mississauga, Ontario. Approximately 12 cm long and 10 cm wide. Comes from the Homotrypa streetsvillensis zone layer of fossiliferous limestone full of bryozoans. The layer is around 18 inches to 2 ft thick, as described by W.S. Dyer in his "Stratigraphy and Paleontology of the Credit River" on pg. 50.-
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From the album: Credit River Fossils from Streetsville, Ontario (Georgian Bay Formation, Upper Member)
Stromatocerium huronense (Billings, 1865) Late Ordovician stromatoporoid sponge. Found along the Credit River at Streetsville, Mississauga, Ontario. Collected as a loose specimen, most likely coming from the Stromatocerium reef of the exposure this came from. Georgian Bay formation, late Ordovician. There is a tiny Favistella alveolata coral colony growing on the edge of the specimen, perhaps this was a commensalistic relationship? Specimen is 12 cm long. However this species in the exposure where it came from can grow beyond a foot in diameter as mounds.-
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When I found this fossil it has some green algal growth on it as I found it on the grass. The algae did not cover the entire fossil but is there some way I can remove the yellow coating of this fossil? I've been scrubbing it with a brush under running water for a while now and some of the dirt does come off.
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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.
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Finally Reached That Exposure- Credit River by Streetsville
JUAN EMMANUEL posted a topic in Fossil Hunting Trips
Yesterday, after countless trips and exploring at the same old spots on the Credit River in Mississauga, Ont., I finally mustered the courage to go and wade on the water to an isolated exposure out the Georgian Bay Formation at Streetsville, Mississauga. I wanted to collect fossils that were not worn out as these were all I was finding in my old spots. I have been setting my eyes on this exposure from the other side of the Credit River for some time now ever since I started collecting along the Streetsville area and it could possibly harbour fresh material. The temperature of the afternoon was around 16-20 degrees Celsius so the water was not chilly as I was expecting it to be. I crossed the water barefoot with the water reaching up my knees at this tributary that separated the exposure from the main path. The Credit has many tributaries flowing and where the these tributaries converged the river, many exposures can be found along these places. After crossing I reached the other side without slipping on the slimy bottom. The exposure had thin footing for exploration but I was able to walk back and forth without slipping onto the water.- 22 replies
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From the album: Credit River Fossils from Streetsville, Ontario (Georgian Bay Formation, Upper Member)
Prismostylus sp. found near Streetsville, Missisauga, Ontario by the banks of the Credit River. Top view of specimen. Georgian Bay Formation, Streetsville Member, late Ordovician, Katian. Formerly called Tetradium, this algae was very common to find in the locality I found this in. Small fragments of this algae can be observed on the limestone but I have seen some specimens that are wider than 20-25 cm in diameter. This specimen is a fragment and is around 15 cm at its widest point.-
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Side Views of the Prismostylus sp. Specimen
JUAN EMMANUEL posted a gallery image in Member Collections
From the album: Credit River Fossils from Streetsville, Ontario (Georgian Bay Formation, Upper Member)
Side view of the Prismostylus sp. specimen. Credit River near the Streetsville area, Mississauga, Ontario. Georgian Bay Formation, Streetsville Member. Late Ordovician.-
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