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Showing results for tags 'devonian'.
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From the album: Trilobites
Hamar Laghdad Formation Djebel Issimour, Morocco -
From the album: Invertebrates
Ophiurina lymani Stuertz, 1890 Early Devonian Emsian Hunsrueck Shale Bundenbach Grube Eschenbach Rhineland-Palatinate Germany -
Rhinopteraspis dunensis Roemer, 1855 - a pteraspidid heterostracan agnathan
oilshale posted a gallery image in Member Collections
From the album: Vertebrates
Rhinopteraspis dunensis Roemer, 1855 Early Devonian Upper Pragian Odenspiel North Rhine-Westphalia Germany Length 10cm / 4" -
Taxonomy from Mindat.org. Together with the small brittlestar Ophiurina lymani. Description for the genus from Südkamp 2017, p. 106" The uniseral arms branch at least once above the second brachial. Proximally they bear pinnules on every second brachial. Beyond the seventh of these, a pinnule is attached to every brachial. Hapalocrinus has quadrangular or rectangular brachials. The anal tube is absent or incipient. The stem is slender. Some elements of the upper stem bear straight spines." Identified by oilshale. References: C. Bartels, M. Poschmann, T. Schindler & M. Wuttke (with contributions by H.-G. Mittmeyer) (2002) Palaeontology and palaeoecology of the Kaub Formation (Lower Emsian, Lower Devonian) at Bundenbach (Hunsrück, SW Germany). Metalla (Bochum) 9.2, p. 105-122. Südkamp, W. (2017) Life in the Devonian. Identification book Hunsrück Slate fossils. Verlag Dr. Friedrich Pfeil, München.
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From the album: Lower Devonian
Acrospirifer arrectus (pedicle valve) Lower Devonian Glenerie Limestone Tristates Group Glenerie, NY. collected 3/18/18 -
First off, I apologize for the poor image quality... The pictures were taken quickly with my phone camera through a microscope. If anyone is interested I'll get out a proper camera later and try again. I found this while searching some Widder formation matrix collected in Arkona ontario. It is roughly 1 mm across. I am fairly certain the tooth belonged to a Xenacanth. Has anyone found these in the area before or did it migrate from somewhere else? Note: the tooth is smooth. The serrated look is caused by pixels in #2
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Location: SE Portage County, Central Wisconsin, USA. Geology: South Western advance of Green Bay Glacial Lobe. Former Glacial Lake Oshkosh. Niagara Escarpment Debris. My land. Ordovician onward. Trying to learn, but am confused. I tentatively identified the below specimen as a Honeycomb coral, based on info from the below and input from local “experts”. None are Paleontologists, but one is a Natural History Museum Director. Begin quote: Favositid tabulates: Honeycomb corals The favositid corals are quite common. They usually formed large colonies. The corallite is prismatic in shape, resembling honeycombs. Favositids have mural pores, tiny holes in the wall of the skeleton, which connect different corallites. These pores are distributed in characteristic patterns and numbers, which are useful for distinguishing the various types of favositids. Favositids lived from the Ordovician to the Permian, at which time they became extinct. They are most abundant in middle Silurian to lower Devonian rock. Favosites is the most common fossil coral in Wisconsin. https://wgnhs.uwex.edu/wisconsin-geology/fossils-of-wisconsin/coral-gallery/corals/ Wisconsin Geological and Natural History Survey, UW Extension The confusing part is that some surfaces of this specimen show no pattern or regular form. Just like most of my finds. Are there any clues to indicate a rock of this structure may be a coral? Other than cutting it open? I have about 50 like this, but only two others show the typical pattern. The rest just have the “circles” on all sides. All are basically the same composition of material, but colors vary. All have inclusions of crystals. My vision is limited, so I only know what I have found after I wash it and look under a lighted magnifier with a loop. Photographing helps a lot as well. I just go on shape and colors when picking up. Then use a small hand held magnifying glass to examine. Sometimes wash off with a little water first. My son in law, who has (almost) a geology minor from local University, is amazed at what the glaciers “dumped” on my land. Note that a large part of the classes were related to local fossils, due to the abundance of them. Please let me know if my ID is correct, and any pointers for identifying specimens which do not show the structure, only the “circles” or “cavities”. Thank you. 1 2 3 4 5 6 7
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Yesterday was chopping through some Dundee Fm (mid Devonian) limestone at a very thick brach/coral layer and found a few of these. The matrix where this is situated in this particular layer has abundant large brachs, gastropods, and large well defined coral colonies. I was just curious as to what sort of brach this may be... if it is one.
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As it is a sunny day, this morning I decided to take a walk out back beyond my house to my little reliable spot of imported lower to mid Devonian fill. I wanted to see how much had weathered out since last season, and to try out a few more rocks that span from Bois Blanc Formation up through the Dundee Formation. As always, I was on the look-out for trilobites. The scene from near the base of the hills: The pit still has a bit too much snow to bother with, so I stuck with probing the hills and its gullies. A lot of the rocks were still frozen into the ground, so hammering a few out was necessary. A sure sign that spring is imminent. Here in southwestern Ontario, usually the first plants to come out (even before crocuses) is this dandelion mimic, Colt's Foot (Tussilago farfara). Only a few isolated clusters were appearing today, but by a week these hills and many other locations with scrabble will be full of these. (continued)
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From the album: Northern's inverts
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From the album: Northern's inverts
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Found in Arkona, Ontario Age: Devonian Size: about 18 mm/0.75 inches Any ideas?
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From the album: Trilobites
Haragan Formation Coal Co., Oklahoma, United States© © 2018 by Jay A. Wollin
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Prone and roller on matrix.
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Coltraneia is named for the jazz saxophonist John Coltrane.
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Crinoid stem segments, Devonian Keyser formation, PA
traveltip1 posted a topic in Fossil Hunting Trips
Crinoid stem segments exposed by February rains, from the Devonian, Keyser Formation limestone, in South Central Pennsylvania.
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Hello, A buddy recently gave me this snazzy trilobite, but unfortunately the label on the back said 'Metacanthina', which I think is wrong.. Is this a New York Bellacartwrightia? Cheers, Marc
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Entry includes detail of eye lenses. One of the defining characteristics of this particular species, apart from the impressive eyes, is the convex nature of the anterior portion of the glabella.
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