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Monterey Formation (Miocene) shell fossils - Arroyo Seco Canyon - Central California Coast Range
ezeemonee posted a topic in Member Collections
Found in Miocene period Monterey formation in Arroyo Seco canyon of Central California Coast Range. Trochita is an undescribed species known from this formation. Others are mostly Brachiopods (Discinisca lamellosa) which surprisingly is not extinct and still lives in some oceans, Scallops (Pectenidae), Venus Clams (Veneridae), Ark Shells (Anadara/Scapharca), and an unknown Moon Snail (Nacticidae). Most found in 2024, some in 2019. Added a few pics of the nice scenery in the canyon. Trochita specimen is noteworthy as being in good condition with surface detail and may get donated to the California Academy of Sciences collection.- 2 replies
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These are very common at an exposure of what I believe to be the Monterey formation (Miocene) in Santa Barbara county, California. They look quite different from most pectinid fossils I've seen in southern CA. Any ideas on ID, or references I should take a look at for this area? Thanks!
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Pipefish Monterey Formation I found and collected this specimen myself and its unusually small. Is it complete? Is it a juvenile?
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New member, first time posting! This object was located a couple of winters ago in the foothills above Los Gatos, CA at about 700' MSL. A large oak tree had fallen over and in the rocks brought to the surface (from a depth of about 3') by the uprooted stump was what appeared to be some sort of a fossil jaw. The inner surface has cavities which very much look like the roots of teeth, especially molars. It reacted very strongly to a drop of dilute HCl acid. About 45 grams in weight. Other fossils found in this area are small "clam" shells, foraminifera, mineralized whale(?) bones, and once I found a shark tooth. Geology maps show this area is Miocene sedimentary but it's quite close to a boundary of Miocene/Oligocene sedimentary. I haven't a clue if this "jaw" is from a mammal, a fish, turtle, (???) or not a jaw at all. Very stout whatever it's from. Any ideas will be much appreciated. Regards, Paul
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Some of the first few fossils I ever collected came from Lompoc, California in the Monterey(?) formation. They definitely fueled my passion for fossils and prehistoric fauna. Anyway, I was wanting to make sure I've got my IDs right for some of the stuff I've collected. #1 This first one is probably the largest piece I found. Is it a pectoral fin from a large fish? #2 was really neat to me. It's a vertebra with what looks like the ribs still attached! #3 And this piece I'm not sure about. It looks like a skull piece from a fish #4 Looks like a mostly complete fish! It looks like its mostly missing the tail and I'm not sure what genus or species it is. It's seriously tiny though. I've got both halves of the head which is cool too. The detail is so small that my phone is having a hard time picking it up unfortunately
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11mm long. Found in Santa Barbara County, near Lake Cachuma, in the Monterey Formation (Miocene). It looks to me like an isopod. I've looked at online databases from the Natural History Museums of Santa Barbara and LA County, and searched the scientific literature, but could not find anything resembling it. I would be very grateful for any suggestions.
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- california
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Taxonomy according to Fossilworks.org. Fritzsche 1980, p. 218 : "Diagnosis.- A Syngnathus with 43-47 dorsal rays; 10 caudal rays; pectoral rays not detectable; 14-15 trunk rings; 51 tail rings; snout 1.5-1.8 in head; orbit 5.8-8.7 in head; brood pouch not seen; largest specimen examined 181mm SL. Description.- Ridges of body smooth and generally not accentuated. Osteology basically the same as in extant species of Syngnathus. Plates small, width of trunk plate less than orbit diameter. Dorsal about as high as depth of adjacent body. Comparisons.- S. emeritus is unusual in having 15 trunk rings combined with 51 tail rings. These characters and the number of dorsal rays distinguish it from S. avus." Identified by oilshale using Fritzsche 1980. References: Fritzsche, R. A. (1980) Revision of the eastern Pacific Syngnathidae (Pisces: Syngnathiformes), including both recent and fossil forms - Proceedings of the California Academy of Sciences (42), 181-227. Wilson, A. B. and Orr, J. W. (2011) The evolutionary origins of Syngnathidae: pipefishes and seahorses. Publications, Agencies and Staff of the U.S. Department of Commerce. 331. https://digitalcommons.unl.edu/usdeptcommercepub/331 Journal of Fish Biology 78, 1603–1623 doi:10.1111/j.1095-8649.2011.02988.x
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Taxonomy according to fossilworks.org. Description from DAVID 1943, p. 11: “Length of head 37,5% to 41%, depth of head 43,8% to 58.8%, depth of body 50% to 63.8% of length of body. Vertebrae 38; 2 small abdominal spines; 12 abdominal lanterns; 3 + ? postabdominal lanterns. Supraneurals project above body for a distance equal to four-fifths of base of dorsal fin. D. =9; A. = 12.” Line drawing from DAVID 1943, p. 60: Photo of a recent Atlantic silver hatchetfish ( Argyropelecus aculeatus) from Wikipedia by SEFSC Pascagoula Laboratory; Collection of Brandi Noble, NOAA/NMFS/SEFSC: Identified by oilshale using David, 1943. References: David, L. R. (1943): Miocene Fishes of Southern California. Geological Society of America Special Paper 43:1-187. Fierstine, H. L., Huddleston R. W., and Takeuchi, G. T. (2012): Catalog of the Neogene bony fishes of California: A ystematic inventory of all published accounts. Occasional Papers of the California Academy of Sciences 159:1-206.
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The specimens that I've collected have washed down from the Monterey Formation, there are three watersheds that flow away from this Formation, I have agatized mammal bone, oysters, and agates from clams, muscles, these are two bivalves, the same species's one is quite larger than the other, also agatized oysters
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- agatized bone
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Greetings all. I had forgotten about this piece of shale that I split while at Jalama a couple of weeks back. To my eye it looks like either a land insect, or possible a sea bug, like a shrimp. Then again, it may be nothing. But just in case it's just to the right side of almost nothing, I figured I'd post an image or two. Thanks for any input provided. Cheers. Rats, I forgot the size reference/index. Length is ~15mm. Exploding fish reference thread. Monterey formation in Santa Barbara, CA, USA.
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Greetings experts, enthusiasts, and fellow pareidolia sufferers. I just got back from spending a couple of nights at Jalama Beach Park. I did manage to get in a little bit of rock splitting while there. I didn't see anything fish-like. After searching for a bit before my back said "no more", I reached the pick end of my hammer over towards a larger chunk of material and gave it a whack on the side where I thought it would split. It split nicely. At first I didn't see anything, and maybe I still didn't see anything, but something did stand out as unusual no matter what it actually is. At the bottom of that balloon shaped staining there is iron-colored staining(?) that is reminiscent of a human fingerprint. And while I know it's impossible for it to be a trilobite in such a formation, the imprint looks like a trilobite stain. The overall shape of the staining also looks like a horseshoe crab. All of that said, I'm thinking that it's most likely a seaweed fossil print something of that nature. Any thoughts are appreciated. If anybody would like another image of another area on the split, let me know. Cheers all. MrR.
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I’ve received a chunk of what I believe to be a marine mammal bone from a diatomite mine in the Monterey Formation in Southern California. It is from the late Miocene but I’m not sure what mammal or what bone it is. I know this is a long shot as there isn’t much to go off of but anybody have a clue?
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Hi! I did search for pea crabs from Carmel Valley and did not find any topics on The Fossil Forum. So, I decided to fill the gap with few links hoping that others will also share the experience.
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So, I have two more fossils (I think), that I could really use help with.... Both found in same location(s) and formation(s) as my prior posts. The first, looks like the impression of a mollusk/shell to me (about 3/4' in diameter) ??? The second, I cant even begin to guess as I would probably be wrong anyway. lol Its corkscrew in shape and about 3/4' long. It left a mirrored impression of itself on the opposing rock. Any thoughts???!!! Thanks in advance. :0)
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- amber
- chino hills
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- arthropod
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Any ideas on this little tooth? C. hastilis or something else. Found in California, Monterey Formation.
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Carcharocles megalodon (Joe Cōcke collection)
Macrophyseter posted a gallery image in Member Collections
From the album: Elasmobranchs
I do not own this rare tooth. It is from the collection of paleontologist Joe Cōcke, which he found locally and gladly allowed me to photograph.-
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Here's a new paleo-reconstuction I drew since the past two days of Albicetus oxymycterus, which is a mid-Miocene raptorial physeteroid none of you have probably heard about. Special thing between this little Moby-Dick and city I live in is that although it was not discovered directly in PV, it was discovered very nearby in Santa Barbara in the same formation and sublayer that exists here which highly suggests that it also swam here 16-14 million years ago. I tried to make this as scientifically accurate as possible using the resources I had, which included the entire 2015 paper establishing the genus Albicetus. I mainly used a pre-existing sketch of Aulophyseter morricei as body reference (which the paper stated is morphologically most similar to A. oxymycterus except for dentition) and used the paper's skull reconstruction for the head. I used a Zygophyseter-like head as the paper stated that the supracranial basin of the skull does not elongate to the end of the maxilla like that of Zygophyseter and Acrophyseter, which both posses snouts as a result. For the body size, I calculated the skull-body ratio by dividing the mean and lower condylobasal length estimates to the total calculated length, which came with either a 1:4.6 or 1:4.9 ratio. (Unrelated to the drawing, the 1:4-5 ratio is based on using a body formula for Physeter and Kogia spp.. If you use the upper Livyatan melvillei /Zygophyseter varolai estimates as reference, a ratio of 1:5.9 and total length of 8.6 meters is calculated) I don't know any of the advanced formulas some of you guys probably do know about and simply used division, so my calculations might not be the most accurate ones. I also put in a diver for scale this time! EXTRAS
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I've been fairly absent from the board the last month and the reason is I got crabs, and the good kind. It was posted a couple years ago by a one time poster/user about Pinnixa galliheri (Rathbun, 1932) from Atascadero, CA, I had since been looking for similar outcrops in the area, considering his front yard is off limits to collecting. A friend of mine, another fossil nut, found a small outcrop by chance while on a walk. The shale is denser and more silicious than the classically known localities near Carmel, CA, also has more iron staining in certain layers, while others we call "Ghost Crabs" since they are white on a grey petroleum chert rich shale. First I'll start with a less common specimen from the Monterey/Carmel area, Parapinnixa miocenica, as described by Mary Rathbun in 1932. I purchased this item on eBay last week, got it in the mail on Monday and prepped it Tuesday, could tell it was just begging to be prepped out I use a PaleoTools MicroJack #2 under magnification for this work, I'm still learning, if you have suggestions please feel free to share. Here is a Before/After sequence:
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