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Showing results for tags 'widder formation'.
Found 7 results
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I came home this afternoon in some ridiculously warm weather for January (50F, 10C) and happened to look at a rock I'd collected from the Widder formation about two or three years ago that I had sitting out weathering. It was one that @Kane had quarried from his Gonaitite perch out of the Widder formation and kicked down to me. I'd originally kept the rock because it had a bunch of Mucrospirifer thedfordensis in it and I wanted to see what else would erode out of it. When I turned the rock over I spotted a small round fossil that was brownish... a different color than most fossils. It was pyritized so I chipped it out of the rock and took a look at it. It was a Gonaitite and one that I had never seen before! Most Gonaitites that I have found at Arkona are from the Arkona formation and fall into the Tornoceras arkonense genus, but this one is different. Tornoceras arkonense above, mystery Gonaitite below. I used a new tool that I recently purchased, a home tattoo pen, to clean out one side of it. The pen is quite effective on softer shale or limestone as long as the fossil is much harder. In this case it was pyritized so I didn't have to worry about damaging the fossil. It turns out that this specimen has a smaller diameter phragmocone than Tornoceras arkonense as there are prominent ridges (rather than gaps as in T. arkonense) along the sutures. The suture pattern is plain with a sweeping parabola facing backwards, a straightish line across the keel and then another parabola. I've looked into the usual sources ("CHECK LIST OF FOSSIL INVERTEBRATES DESCRIBED FROM THE MIDDLE DEVONIAN ROCKS OF THE THEDFORD-ARKONA REGION OF SOUTHWESTERN ONTARIO", Stumm and Wright, Paleontology of New York, Hall) and don't see much that correlates to what I've found. Anyone have an idea? The fossil itself is 7/16" (11mm) at it's widest and 2/16" (4mm) thick. It comes from the Middle Devonian aged (Givetian stage) Widder formation at Hungry Hollow, Ontario, Canada. Thanks for looking!
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I found this orthocone a while back at Arkona (devonian) and I thought it was dolorthoceras, but now I am not so sure. It has a strange mark protruding from centre of each chamber. Any help would be appreciated! d!
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Mucrospirifer thedfordensis - fossil brachiopod A.JPG
Dpaul7 posted a gallery image in Member Collections
From the album: MY FOSSIL Collection - Dpaul7
Fossil Brachiopod - Mucrospirifer thedfordensis (Front and back views) Widder Formation, Ontario, Canada Middle Devonian 383-393 Million Years ago Mucrospirifer is a genus of extinct brachiopods in the class Rhynchonellata (Articulata) and the order Spiriferida. They are sometimes known as "butterfly shells". Like other brachiopods, they were filter feeders. These fossils occur mainly in Middle Devonian strata. The biconvex shell was typically 2.5 cm long, but sometimes grew to 4 cm. The shell of Mucrospirifer has a fold, sulcus and costae. It is greatly elongated along the hinge line, which extends outward to form sharp points. This gives them a fin- or wing-like appearance. The apex area (umbo) of the pedicle valve contains a small fold for the pedicle. Mucrospirifer lived in muddy marine sediments, and were attached to the sea floor via the pedicle. The shell sometimes looks like two seashells stuck together. Brachiopods, sometimes called lamp shells, are filter feeders and are attached to the sea floor by a fibrous pedicle that extends from a hole in the pedicle valve. The “wings” of the spirifers possibly stabilized the shell in the sea floor sediments. In order to feed, brachiopod shells had to be open. The lophophore, a combination of a feeding and respiratory organ, had a number of tiny tentacles that created a current to allow filter feeding. It was supported by two arms attached to the interior of the brachial valve. This was an evolutionary disadvantage when compared to bivalve molluscs, which could feed through siphons with the shells tightly closed. The first brachiopods appeared in the early Cambrian. Some brachiopods have survived competition from molluscs, today generally living in very deep or cold water. Kingdom: Animalia Phylum: Brachiopoda Class: Rhynchonellata Order: †Spiriferida Family: †Mucrospiriferidae Genus: †Mucrospirifer Species: †thedfordensis -
Mucrospirifer thedfordensis - fossil brachiopod A.JPG
Dpaul7 posted a gallery image in Member Collections
From the album: MY FOSSIL Collection - Dpaul7
Fossil Brachiopod - Mucrospirifer thedfordensis (Front and back views) Widder Formation, Ontario, Canada Middle Devonian 383-393 Million Years ago Mucrospirifer is a genus of extinct brachiopods in the class Rhynchonellata (Articulata) and the order Spiriferida. They are sometimes known as "butterfly shells". Like other brachiopods, they were filter feeders. These fossils occur mainly in Middle Devonian strata. The biconvex shell was typically 2.5 cm long, but sometimes grew to 4 cm. The shell of Mucrospirifer has a fold, sulcus and costae. It is greatly elongated along the hinge line, which extends outward to form sharp points. This gives them a fin- or wing-like appearance. The apex area (umbo) of the pedicle valve contains a small fold for the pedicle. Mucrospirifer lived in muddy marine sediments, and were attached to the sea floor via the pedicle. The shell sometimes looks like two seashells stuck together. Brachiopods, sometimes called lamp shells, are filter feeders and are attached to the sea floor by a fibrous pedicle that extends from a hole in the pedicle valve. The “wings” of the spirifers possibly stabilized the shell in the sea floor sediments. In order to feed, brachiopod shells had to be open. The lophophore, a combination of a feeding and respiratory organ, had a number of tiny tentacles that created a current to allow filter feeding. It was supported by two arms attached to the interior of the brachial valve. This was an evolutionary disadvantage when compared to bivalve molluscs, which could feed through siphons with the shells tightly closed. The first brachiopods appeared in the early Cambrian. Some brachiopods have survived competition from molluscs, today generally living in very deep or cold water. Kingdom: Animalia Phylum: Brachiopoda Class: Rhynchonellata Order: †Spiriferida Family: †Mucrospiriferidae Genus: †Mucrospirifer Species: †thedfordensis -
Good day, this is a fossil collected from the Widder Formation at Hungry Hollow. I was wondering if someone might know what this is? It is 3.8 cm x 4 cm and appears to have dimples across its surface, what I believe to have been spines. THANK YOU, Corey Lablans
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Let me begin this topic by saying that I am notoriously bad for posting pictures. Perhaps it's one of those little jobs that always feels like it will take a lot more time and effort than it actually does, so it gets avoided constantly. Perhaps it's because I don't actually have photographs (decent quality ones) of most of my collection. But regardless, I'm terrible for posting pictures. So, this evening, with a bit of free time on my hands, I decided to take advantage of the knowledgeable folks here who have experience with the Arkona fauna and try and pin down some IDs on a few specimens. Going through my photo collections I came across a few photos of things that might be useful for identification purposes. So here's the first one (2011.4.18), currently identified as Platyaxum frondosum.
