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Showing results for tags 'upper ordovician'.
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Hi all! I just got back from a little hunt with the kids along Etobicoke Creek here in Mississauga, Ontario (Georgian Bay Formation, Upper Ordovician), and I'm wondering if I perhaps found a trilobite pygidium? Here are some pictures: Front of rock (lots of little branching bryozoans and some crinoid bits): Back of rock (where the possible trilobite pygidium is located - circled in red): Close-up of possible trilobite pygidium: What do you think? And, if it is indeed a trilobite pygidium, can it be identified any further? Thanks in advance! Monica
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- etobicoke creek
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Quite a large specimen even for this quite big species. The length given is of the animal along the centre of its back, not the diameter.
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- alnif
- anti atlas
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I found this in an old quarry at the foot of the Old Man of Coniston, Cumbria, England about 30 years back. It's from the Ashgill Shales, so is very uppermost Hirnantian, Upper Ordovician. It was a dome shape but broke during extraction,to reveal a smaller dome within the dome and so on, but is built up of layers and layers though the 'tubes' running through it also continue upwards and outwards from the base. Is it Fisherites ? It's about 3.5 cm in diameter but was a little bit bigger. Thanks for any help. Top : Side : Side and base : Base :
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Hello, Roommates! I received this little trilobite as part of my Secret Santa package, and, though i know the eyes are missing, and parts of the pygidium etc., am rather fond of the little fellow. The label with it said Illaenus americanus and it was said to be from the Galena Limestone, Upper Ordovician nr, Postville, North East Iowa, a quarry or a roadcutting. Now the first thing I discovered, and please correct me if I'm wrong, is that the name is no longer valid and this is now Thaleops laurentiana. And on looking closer, it doesn't seem to be it at all. The lack of axial furrows and general effacement led to me to think Bumastoides sp. so i then read up on the paper https://www.researchgate.net/publication/257656692_A_systematic_revision_of_the_Upper_Ordovician_trilobite_genus_Bumastoides_Illaenidae_with_new_species_from_Oklahoma_Virginia_and_Missouri?enrichId=rgreq-42948ac4406fefc77dead768950eae0b-XXX&enrichSource=Y292ZXJQYWdlOzI1NzY1NjY5MjtBUzo5NzE0MzExMzEyNTg5NUAxNDAwMTcyMTMxNjE4&el=1_x_2&_esc=publicationCoverPdf and so on. I also discovered this (second item down, left hand margin : http://www.robertcharleswolf.net/newsletter942186.htm So it could actually be Maquoketa Formation, Elgin Member. The specimen seems to have 10 segments in the thorax so I'm thinking B. porrectus or B. beckeri. Any help greatly appreciated, here are a few photos:
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- bumastoides
- galena formation galena group
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The dimensions given are for the largest specimen. The block is 11.5 com at it's widest point by 10 cm and 2 cm deep. Most of the of the other species ascribed to this genus in Morocco are now considered junior synonyms. See https://link.springer.com/chapter/10.1007%2F978-3-319-04364-7_199 Notice that they are all aligned in one direction as they were buried by a mudflow sweeping in from the continent. The arms, bodies and stems are all pretty much aligned. This seems to have occurred fairly regularly in this area at this time. Also notice younger, smaller specimens have fewer plates and arms.
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- ascocystites
- ascocystites drabowensis
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HI all! I was just casually perusing my fossils, and I noticed that there are some black fragments on a rock that contains an orthoconic nautiloid that I found at Etobicoke Creek here in Mississauga, Ontario (Georgian Bay Formation, Upper Ordovician). Are these black fragments fossil-related, or are they something else? Please see pictures below: Thanks for your input! Monica
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Hello all! It's been a while since I last put up something to be identified because it's been a very busy few months (we recently sold our old house and have moved into our new house - yay!!!) I did get out with the kids today, though (mainly because Viola has to take her Brownie group's owl all over the place this week, and we thought that it would be fun to take him fossil-hunting ), and there's one potential fossil and one rock that I'd like your thoughts on... Picture #1: Viola with her Brownie group's owl (Oscar) and a fairly large orthoconic nautiloid Picture #2: The potential fossil - could it be part of an Isotelus sp. trilobite? Or is it something human-made? Picture #3: A cool-looking rock - any ideas as to what type it is? Thanks in advance for your help! Monica
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- etobicoke creek
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From the album: MY FOSSIL Collection - Dpaul7
Calymene Trilobite Specimens Ktaoua Group, Anti-Atlas region, Morocco TIME PERIOD: Upper Ordovician (445-458 Million Years ago) Data: Calymene (meaning beautiful crescent as a reference to the glabella) is a genus of trilobites in the order Phacopida that are found throughout North America, North Africa, and Europe in primarily Silurian outcrops. Calymene is closely related to Flexicalymene, and both genera are frequently found inrolled. Calymene trilobites are small, typically 2 cm in length. Their cephalon is the widest part of the animal, and the thorax is usually in 13 segments. Kingdom: Animalia Phylum: Arthropoda Class: †Trilobita Order: †Phacopida Family: †Calymenidae Genus: †Calymene -
From the album: MY FOSSIL Collection - Dpaul7
Calymene Trilobite Specimens Ktaoua Group, Anti-Atlas region, Morocco TIME PERIOD: Upper Ordovician (445-458 Million Years ago) Data: Calymene (meaning beautiful crescent as a reference to the glabella) is a genus of trilobites in the order Phacopida that are found throughout North America, North Africa, and Europe in primarily Silurian outcrops. Calymene is closely related to Flexicalymene, and both genera are frequently found inrolled. Calymene trilobites are small, typically 2 cm in length. Their cephalon is the widest part of the animal, and the thorax is usually in 13 segments. Kingdom: Animalia Phylum: Arthropoda Class: †Trilobita Order: †Phacopida Family: †Calymenidae Genus: †Calymene -
A nice Dictyonema flabelliforme dendroid graptolite from Oslo Fields in Norway. It's Tremadoc, Lower Ordovician in age and is thus maybe around 480 mya. Another angle :
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- amplexopora
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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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Hello once again! Yesterday afternoon I had the kids to myself so I suggested that we head out to our local site for a little fossil-hunting. Viola was game, as usual, but William wasn't interested. I wouldn't take no for an answer, however, and so we headed off. All in all it was a nice few hours outdoors and, ironically enough, William didn't want to leave when Viola and I were ready to go! Hopefully this means he'll be willing to come along more often from now on. I took a few pictures of our outing - enjoy! Monica Picture #1: Viola leading the way Picture #2: William searching for fossils (he didn't find any this time ) Picture #3: A pair of Mallard ducks in the creek Picture #4: A couple of orthoconic nautiloids in a rock that's much too big to take home with us Picture #5: Viola holding up a pretty orthoconic nautiloid that was small enough to take home with us (By the way: you can see William in the background, playing in the creek - he had lost interest in looking for fossils by this point but at least he was finding something to do to keep himself amused!) Picture #6: There's a pretty little brachiopod somewhere in this picture - can you see it? Picture #7: Here's the brachiopod! The rock that it was in was too big to take with us, so we left it where we found it Picture #8: Our little haul of fossils: A - F are mine, G - J are Viola's (she found G, H, I and I found J and gave it to her since she loves her shells ) A, B, and C - snails D - brachiopod E - crinoid stems (I think) at interesting angles F - orthoconic nautiloid G - bivalve imprints (they are pretty faint so we may end up bringing it back to the creek) H - orthoconic nautiloid I - crinoid columnals J - bivalve
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- etobicoke creek
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Recently found this trilobite peaking out of the matrix. At first, I was certain it was just a pygidium. After prepping a bit, I was pleasantly surprised that it hopefully appears to be complete. Before progressing with the prep, I would like to ID this so I can prevent any accidents from occurring due to my ignorance. Thanks Mike
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Hello everyone! Ken @digit suggested that I take a few pictures of the play-date that Viola and I had organized this afternoon with one of her friends from her Spark (Girl Guide for 5-6 year-olds) group, and so I did! Enjoy! Monica Picture #1: Viola looking out at one of our usual collecting sites along Etobicoke Creek Picture #2: Viola and her friend washing off a fossil in the creek Picture #3: Viola showing off the orthoconic nautiloid that she found. It's a fairly large piece of rock, so I asked Viola if she was sure that she wanted to keep it - she of course said yes. Then I asked what we were going to do with it - she said that we can put it out as a "family display," so I guess that's what we'll do (as soon as we find a suitable place for it) Picture #4: Viola and her friend traipsing along the rocks beside the creek Picture #5: Me and Viola - I'm holding a rock that contains a couple of brachiopod shells that I gifted to Viola (since, as you already know, she loves shells!) Picture #6: Viola's orthoconic nautiloid that will eventually be displayed for the entire family to enjoy Picture #7: The rock containing brachiopod shells (as well as some other things) that I found as well as a pretty little crinoid columnal that Viola found - both are already residing in Viola's room
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Hello once again! Yesterday when I went out with Viola to Mimico Creek in Toronto (Georgian Bay Formation, Upper Ordovician), I found an interesting piece and I'd like your thoughts regarding its identity. The dome-shaped object in the photos below has bumps all over it, and there are tiny pores throughout, so I was wondering if you think it's a bryozoan or perhaps a stromatoporid (apparently Labechia huronensis is a bumpy-looking stromatoporid that can be found in the Georgian Bay Formation, but MANY bryozoans can be found here, too - including on this piece of rock! - so I'm not sure which it is). "Front" of specimen: "Back" of specimen: What is the conical-shaped, segmented item in the upper right-hand corner, by the way? Closer views of the bumpy, dome-shaped object: Thanks for your help! Monica
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- bryozoan
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Hello once again! Viola and I went to a new location for a little fossil-hunting this afternoon, and we think that she may have found a rough-looking trilobite - what do you think? We found it by Mimico Creek in Toronto (Georgian Bay Formation, Upper Ordovician). It's in a massive piece of rock so if it is indeed a trilobite then we'll have to find a way to cut the rock to save only her little treasure Thanks in advance! Monica
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Hello all! Viola and I went out to our local haunt yesterday afternoon and we found our usual items, but what follows are pictures of a couple of rocks that are a little different from what I'm used to seeing - your thoughts and opinions are much appreciated!!! Monica Item #1: "front" It looks bryozoan-like, but it's a lot bigger than what I'm used to seeing... Item #1: "back" It still looks like a bryozoan but, again, it's quite a large structure overall (even though the filament-type structures are very thin)... Item #2: gastropod - any idea as to what type?
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Hi everyone! Well, I've "damaged" my first fossil Actually, to be honest, a student "damaged" the hash plate by removing one of the crinoid discs that was on it - I've circled the disc that was removed in the picture below: I know that it's only one of many discs on a hash plate that's full of them, but I'd like to repair it if I can. What would you recommend is the best adhesive to use to re-attach the disc that's been removed? Thanks in advance for your help! Monica
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Hello everyone! Yesterday afternoon I went out to my usual site (Etobicoke Creek, Georgian Bay Formation, Upper Ordovician) and I found a couple of items that I've not found before... Specimen #1: possible trilobite trace fossil (Have I FINALLY found something that is trilobite-related for certain?!) Specimen #2: possible coral - the diameter of the corallites (if that's what they are) ranges from 2-3 mm Thanks for looking! Monica PS - I actually went out with both of my kids yesterday. Viola (almost 6 years old) found her usual stuff - lost of rocks containing crinoid discs. It was the first time I took William (3 years old) with me, and he actually found a fossil all by himself - it's just a rock that once had either a small orthocone nautiloid or a piece of crinoid stem in it, but he's pretty proud of himself
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Hello everyone! I went out to my local haunt this past weekend, hoping to find a trilobite, and instead I found another specimen that I had not found up until this point - a coral! It was found at Etobicoke Creek, Georgian Bay Formation, Upper Ordovician. I'm thinking that it is a solitary rugose coral - confirmation of this, or a correction if I'm incorrect, would be greatly appreciated! Here are two pictures of the 5cm X 2.5cm specimen: By the way, would it be possible to identify the specimen down to genus or even species, or (a) is it too difficult to fully identify rugose corals without taking sections, or (b) is my particular specimen too squished to be able to identify it any further? Thanks for your help! Monica
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From the album: Scolecodonts
Scolecodont fragment (Interior face) Size: Approx. 1.5 mm. Found in surface-collected muddy matrix, which could have weathered from any of three different formations, listed below. Upper Ordovician Waynesville/ Liberty/ Arnheim Fms. Cincinnati Group Bon Well Hill Outcrop Brookville, IN -
From the album: Scolecodonts
Scolecodont fragment (Exterior face) Size: Approx. 1.5 mm. Found in surface-collected muddy matrix, which could have weathered from any of three different formations, listed below. Upper Ordovician Waynesville/ Liberty/ Arnheim Fms. Cincinnati Group Bon Well Hill Outcrop Brookville, IN -
From the album: Scolecodonts
Scolecodont fragment (Right side view) Size: Approx. 1.5 mm. Found in surface-collected muddy matrix, which could have weathered from any of three different formations, listed below. Upper Ordovician Waynesville/ Liberty/ Arnheim Fms. Cincinnati Group Bon Well Hill Outcrop Brookville, IN -
From the album: Scolecodonts
Scolecodont fragment (Left side view) Size: Approx. 1.5 mm. Found in surface-collected muddy matrix, which could have weathered from any of three different formations, listed below. Upper Ordovician Waynesville/ Liberty/ Arnheim Fms. Cincinnati Group Bon Well Hill Outcrop Brookville, IN -
From the album: Scolecodonts
Scolecodont fragment (Right side view) Size: Approx. 2 mm. Found in surface-collected muddy matrix, which could have weathered from any of three different formations, listed below. Upper Ordovician Waynesville/ Liberty/ Arnheim Fms. Cincinnati Group Bon Well Hill Outcrop Brookville, IN
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