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Showing results for tags 'Orthocone'.
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I spent yesterday trying out a location along the southwest corner of Tug Hill Plateau in Oswego County NY. There is a road cut exposure that is very weathered. Lots of crumbly mud- and silt-stone, interspersed with sandstone. I couldn’t get very low on the exposure because the river that the highway crosses was high, no shelf or margin of error to climb down. On the Rockd app, this is supposed to be late Ordovician Pulaski and Whetstone gulf, and I wanted to find trilobites. I think I found one fragile flexicalymene, Prasopora (chocolate drop bryozoan), and a big orthocone. Very few trilobite remains in any layer I examined. I hope to return this summer when the water of the river is low...
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- bryozoan
- flexicalymene
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I made a trip to my new favorite Upper Ordovician (Drakes Formation) spot today (working on a field trip report ). I came across a few of these cylinders, which I believe are orthoconic nautiloids. I found them in many different sizes. Some taper as I would expect from an orthocone. However, they do not have the suture lines or septa that I am used to seeing. Some have what appears to be a possible siphuncle in the center while others do not. Here are a few pics of some of the more interesting ones. I can provide more if needed. Thoughts? Thanks in advance for any assistance! This one is about 3cm in diameter and 7.5 cm length. Number 8 in first pic. There are also a couple that have this twisting pattern on the outside. This one is about 5cm in diameter and 3.5 in length. Number 4 in first pic. Possible Siphuncle? 1 cm in diameter. Number 7.
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- drakes formation
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small orthoconic nautiloids versus tentaculites? What should I look for?
SteveE posted a topic in Fossil ID
Blair County, Pennsylvania (USA) Silurian... According to the map the likely guess is Clinton Formation, but my gut on site said "Wills Creek" Anyway, what do I have here? Small straight nautiloids or Tentaculites? How do you tell them apart?
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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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From the album: Finds From the Ordovician -488 to 443 MYA-
Section of Endoceras, from the Collingwood member of the Lindsay (Cobourg) Fm. -
Need help with identification. I have a pretty strong idea that this is a weathered section of a cephalopod but I would like to be certain. Your feedback (as always) is appreciated. :)-
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- nautiloids
- orthocone
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This summer I was once again able to look for fossils near Newberry, MI in a degrading hill filled with drift. In my research recently, I came across a paper on the Collingwood formation drift in Newberry, and was excited to find exact descriptions of some of the layered rocks found there. I am including photos of one of them, split into its layers...and the orthocones revealed in thos layers. The orthocone has a very thin shell of some kind....they are always found flattened and usually with that line down the center indicating what was once rounded has been squished flat. In the 4.5 " orthocone showing (the third image and about 6" overall) even the open edge presents a somewhat curved opening. usually it is squared across. Over the years I have found these triangular shaped creatures filling the shale...from 1/4 " long smattering of them all over a hashplate, to the ones that average 4 or so inches. I have not been able to figure them them out. The interesting paper I read doesn't mention them, which was a surprise to me since they are so plentiful. At any rate, If someone has a suggestion I would appreciate it. The other thing I am curious about, is the geologic process that formed this rock...for each of them, the split layers reveal creatures...in one of my rocks, each layer is filled with graptolites. So what was the process by which the layers formed....rain storms that roiled the sediment and trapped a layer of animal...followed by a week or month or day or year storm that layered another 1/2 inch of sediment and captured another layer of creatures....and how did this layer than get broken up into cobbles....(the animal remains found in each of the layers sames to be consistent with all the other layers of each, so I am assuming a rather quick succession of silt was laid down....in a somewhat regular pattern.
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I finaly got around putting all my best cephalopods specimens that I collected over the past 4 years in the frasnian of southern Belgium on there place in the cabinets. They all come from the same location. (except an orthocone and a receptaculites from the same age but from a different spot ) most of it has already been posted in individual posts, but this gives an overal vieuw of the part of the collection on display. Enjoy al the Manticoceras, Crickites, Tornoceras, Bactrites, Orthocones and more
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Wanted to take advantage of the good weather and went to the creek on my farm to see if I could find anything good. The creek is located on a farm in Northern Kentucky, located in a small valley amongst the hills. As soon as I reached the creek and knelt down, I spotted this beautiful specimen and instantly recognized the shape and tapering. I can’t find any septa on it though. I find an abundance of bryozoans, brachiopods and crinoid stems. Few weeks ago, found a fragment of orthocone and had it verified on here. This is only my second and so are pretty rare on our land. Just wanted to show you all, make sure 100% it’s the real deal since you all know much, much more than I. Don’t want to keep a rock or petrified ice cream cone around.
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Found this while searching the creeks located around my farm. I find a lot of bryozoans, brachiopods, crinoid stems and that’s about it. Never have found a fossil like this around here before, though I know Northern Kentucky has found orthocone fossils before. Interested in what you all think!
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Hi, noone will hurt my feelings if this turns out to be geological and not an orthocone cast. I was exploring for other fossils when I chanced upon 3 separate specimens of the following. They were all about the same dimensions and appearance so I decided to bring one home. What the heck it only weighed a couple of pounds. 7.5" x 3" at the widest. Elliptical shape on left end a side view
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- lower pennsylvanian
- orthocone
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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 everyone. Picked these up yesterday in my garden. The orthoceras orthocone are familiar as is the piece of a goniatite (3rd one here so far) but am wondering what the larger piece is ? It is very smooth, and has the same color, texture and symmetry as the goniatites but is much thinner in proportion. Pictured is both sides and a longitudinal view to hopefully show the symmetry and relatively thin profile. Does it look familiar to any of you ? Thanks.
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I have several pieces similar to this from a drift hill near Newberry, UP, Michigan. I have been told it is Collingswood?, and found very nice pseudogygites impressions there, none whole however, just adding that for the location. At any rate, I have been trying to figure out what these orthocones are. I have several layered from various rocks which are quite small...little cone shaped impressions from 1/2 " to these. all of them are flattened, with that distinctive crush mark down the middle, where the oval part collapsed. My reason for this post, other than still being curious as to what these creatures were, is how do I preserve them...most often I have both top and bottom impressions, filled with the flattened material of the creature between them...much like a flattened trilobite. But as they dry, the animal part is beginning to flake off...is there something I can do to preserve them, other than slathering them with some kind of glue...I have used butvar b76 on some of the bones I've collected, but these seem too fragile for that kind of application. Suggestions would be greatly appreciated. (1 is the rock with layers cracked, 3 is the image from the third layer, 2 is the image from the second layer, each of these layers have orthocone images in them, ranging from about 6" down to 1.)
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I have been watching comments about pyrite for awhile, and have shown my sample, in situ, along with two orthocones that would be nice to identify. they are from a Northern Wisconsin quarry about 15 miles due east of Green Bay. When I first started looking for fossils around my home town, I was told there weren't any because the glacier scraped away the material...since then, i have learned there are fairly large swathes of geology that do contain wonderful fossils...most often found from quarries, where the Glaciers didnt scrap deeply enough to affect them, or from areas possibly missed as in the makoqueta shale near Green Bay. At any rate, what I am interested in is the process by which the pyrite is formed. Does iron seep into the crevice for a fossil was formed, or is the iron actually from the body of the animal itself. For example, in the conesauga shale trilobites ( which are all wonderful by the way) many impressions are surrounded by a circle detail left from gasses that leached into the surrounding area...are these iron oxides from the body of the animal also...and are they therefore considered some form of fossil as well? Thanks for the knowledge, in advance. (the pyrite is about 2 inches across, the deep ridged impression about 6 inch long, and the orthocone about 18". It was my first fossil trip in the area and I had no measuring tools along. The large orthocone was in a block of about 600 pounds or it would have been coming home with me...LOL>
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I should preface this post by saying that the Paleozoic, marine ecosystems, and invertebrates are not generally my primary expertise, so I apologize if I am wildly off base or asking stupid questions. Sadly, I did not find these specimens myself, and so I do not have any particularly useful information on age or location. They were left in a desk drawer along with a collection of other invertebrate fossils, most (if not all) of which are Paleozoic in age. I have several different specimens of orthocone nautiloids, and I would love to know if anyone can refine that identification further. To make the situation more difficult, the siphuncle is only preserved in one of the specimens so far as I can tell (first set of photos below). For this specimen, the diameter of the nautiloid is ~3.5 cm (depending on exactly where it is measured), the inner diameter visible on top and the diameter of the siphuncle on the bottom are 4 mm, and the outer diameter is 8 mm. Here are the pictures. Thank you in advance for your time and input. Specimen #1: Specimen #2:
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While at the ABQ Gem and Mineral show on Sunday, I spotted this cool little Nautiloid... ...I could not help myself. The information: Does anyone recognize the matrix/fossils and perhaps some guidance on literature? Thanks for your help.
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- cincinnati
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Hello all! Recently I have been obsessed with cephalopods and realized there is a real lack of reconstructions of the color patterns on extinct nautiloids and ammonites! This led me to compile a list of known fossil color patterns on cephalopods. After a year of on and off research, I found about 90 species of cephalopods retaining official or undescribed, original patterning on their shells. These are the first 15 species on my list. The color markings are based both on descriptions and photographs of the fossil material. The shades of the markings are based on the fossils, but also inferred. I Hope you will appreciate my work!
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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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I have recently been looking over rock hash plates from Newberry, Mich. I think the formation is Collingswood, at any rate, there are cone shaped fossils all over many of the plates I brought home, ranging from a max of 4 " to as small as 1/4 inch. I previously asked about these, and most respondants seem to suggest some kind of Tentaculites. I can see the crushed shell in most with the tell tail impression down the center indication they were once round, but I have still been tryinig to figure out if they really are tentaculites, or perhaps orthocone larva...At any rate, my point for today is, one of the plates seem to have captured the skin impression clearly. I thought at first perhaps the 4" piece I was looking at was simply covered in some kind of bryazoan, but when I looked at the others on the same plate, they all contained the pattern, and it was way too perfect , fitting the fossil's form perfectly...it looks sort of like snake skin. I would appreciate any comments... thanks. I think the forum is great, it has moved me from a very beginner who saw stones I was sure were fossils, to a beginner who can occasionally tell the difference. LOL>
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Found this piece of large (for the location) orthocone yesterday in a Brigantian (Mississippian) mudstone. The thin bits of surviving shell are apparently pierced through with many small round objects, mostly circular, 0.3 - 0.5 mm in diameter. Each one is now a very low cylinder (like a watch battery) with apparently vertical sides and depressed centre. Many are filled with pyrite. They have left impressions on the mudstone internal mould - the whole shell fossil is covered with them, both the living chamber and chambered phragmocone. Ostracods came to mind but these seem to go right through the shell and the spacing is quite regular so was whatever they were growing there? Orthocones and many other types of shell are common from this location but I've never seen this before. And one more:
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- carboniferous
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Hi, I found this fossil a few years ago on the shoreline of lake ontario right in the city of Kingston Ontario. I believe the exposures here are upper Ordovician age limestone (Gull River formation) however there may have been fill brought in from elsewhere to stabilize the shoreline so this fossil may not be exactly local. It looks to have a siphuncle (acentral) and sutures (relatively close together) so I thought it appeared to be some type of orthocone nautiloid of some type. Based on Bill Hessin's field guide "South Central Ontario Fossils" I thought i might be Gonioceras anceps or Actinoceras but I really don't know. The pics here are not great, but hopefully someone has some ideas. Thanks
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More Triassic Ammonoids prep. (Not the same that those of Andreas ;-))
Nothos posted a topic in Fossil Preparation
Hi fossils friends, here is a little taphonomic accumulation plate with many Olenekian (lower Triassic) Ammonoids. It comes from the Vikinghøgda Formation - Sassendalen group (Sassendalen valley - Spitsbergen island - Svalbard archipelago - Norway) Most of the Ammonoids are Svalbardiceras spitzbergensis (Freblod, 1930). Associated on the plate is an unidentified orthoconic Nautiloid (never seen this in the associated litterature), a bivalve and a partial Ammonoid from the Hedenstroemiidae family (at the top-left). Size of the plate is 11,5 X 9,5 cm. I prepared it with my Dremel engraver in about 8 hours.
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Hi, My family co-owns some property along the Cacapon River in West Virginia, and we often find small fossil shells in great numbers along the roads and creeks. Here are a couple pictures for reference, I think they're Brachiopods? https://i.imgur.com/C3D0QUU.jpg https://i.imgur.com/dWgZ617.jpg There are tons of rocks like this in the area, most of which are brittle shale. You can find them just about anywhere, but they're most common on the banks around small creeks. The shell impression on the bottom right of the second image was the largest fossil we'd ever found there, but within a few minutes we stumbled across something similarly sized that we've never seen before. https://i.imgur.com/NbYwr9R.jpg It's about four inches long, segmented, and tapers toward the end. Up close it has a very fine texture pattern that reminded me of coral. A volunteer at our local library seems confident it's the impression from an Orthocone shell, but I wanted to be certain. Can anyone give us an ID? Thanks very much!
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Found this fossil in a creek in middle Tennessee. I originally thought it was a crinoid column, until user ynot pointed out that it was more than likely an orthocone shell. Judging from where it was found, it seems to be from the Ordovician. So now my question is: what species of orthocone do you think it is? Note the size (5 1/2" long, 2" wide) and the segmented pattern. Thanks for the help!
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