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Showing results for tags 'Miocene'.
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Found this large bivalve/clam in the new creek bed spot I discovered. As mentioned in a previous post, the spot is mainly Great Valley complex sedimentary rocks (Cretaceous), but also bordering Eocene sedimentary, Miocene sedimentary, and some intrusion of Pleistocene alluvium known. This was free-floating. These type of white clam fossils are relatively common in the SF Bay Area, but this is by far the largest I've found. Can anybody speculate as to how rare this size/quality of specimen is? It measures 48mm x 45mm x 37mm and quite dense/heavy. Any taxonomical speculation would be appreciated as well. Thanks in advance! RCD
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My 5 YO son found this just over our backyard fence in a seasonal creek bed. As you can see, appears to be a nice shell fossil, but what is most interesting to my son and I is what looks to be an impression of a shark tooth. The shape looks right. What do you all think? Is that a shark tooth impression? Also, any idea of what kind of shell (gastropod?) that is? BTW, The creek is a main drainage of the Northwest flanks of Mt. Diablo in the SF Bay Area, CA, USA. Every winter rocks and boulders wash down the creek, so I cannot know the specific geological time zone, but we've found fossils a couple of miles upstream. There is a band of Miocene formation that borders the area, but certainly other geological time rock areas within the watershed as well.
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From the album: Skeleton models
Miocene of North America Modified from molerat-skeleton scan© Jan Frost
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Got some weird stuff from the Cliffs, been meaning to get them checked out. first one up i think is a bone fragment of some kind. it passes the tongue test. but someone on the FB group suggested it might be a fragment of a Gomp tooth perhaps? this is a bone fragment, but the porous nature of the middle has me thinking bird perhaps? also, the top edge is rounded and smooth so it looks to be a small diameter long bone. lastly is this piece, Im sure its probably a beaten up snaggletooth, but the cross section has me thinking mammal possibly?
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I was out hunting yesterday to a miocene_pliocene site that produces mostly small shark teeth with occasional surprises. In this instance there were three. 1st up... Upper molar Nannippus aztecus (11-5 mya) upper molar. Certainly Nannippus, likely aztecus based on size and location. Next , my unknown, a dolphin periotic earbone, 29 x 16 mm well worn and found in a miocene site. @Boesse And finally a Bison or Bos lower m3 unerupted enamel cap .. no roots. I was quite excited seeing the complete enamel in excellent unworn quality. But based on size and lack of wear, it is probably Bos... Looking for any different opinions
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- bonevalley
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I' m a local photographer in Flagler Beach, FL. I frequent a local beach almost daily. I have come across quite an interesting find. Currently due to stormy weather causing rough waves and some higher than normal tides the rocks have been sliding down into the ocean and breaking apart. Well a wonderful treasure was exposed in one of the rocks. A skull. There is also a tooth and what looks to be bone vertebrate. I am in the process of excavating currently but would love to know who this skull belongs to. Any help is appreciated!!
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Need some help with identifying this fish vertebrate, can this one be a tuna vert? The size is a little bit more than 4 cm.
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Dominican Amber (La Toca Fm. [Mamey Group], 20.43-13.65 Ma.)
Barrelcactusaddict posted a gallery image in Member Collections
![Dominican Amber (La Toca Fm. [Mamey Group], 20.43-13.65 Ma.)](//content.invisioncic.com/e327962/monthly_2022_04/small.20220420_212338_resized_resized(1).jpg.7743a4a2a0e1a834bfb134b1544c0aaf.jpg)
From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight 7.5W S11 Incandescent Light There are 9 complete and 2 incomplete Leptomyrmex, averaging 3.5mm in body length. Other prominent inclusions consist of a twig (7mm), spider (2mm), formicine ant (3mm), two muscoid flies (1.5mm), and two nematoceran flies (possible chironomid at 1mm, heavily decomposed mycetophilid at 3mm).© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Dorsal view, 3mm body length; same individual as seen in related images. Contained within same amber piece as contains the Leptomyrmex ants, spider, muscoid and nematoceran flies, twig, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Lateral view, 3mm body length; same individual as seen in related images. Contained within same amber piece as contains the Leptomyrmex ants, spider, muscoid and nematoceran flies, twig, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Ventral view of a 3mm long formicine ant; same individual as seen in related images. Unfortunately, the mandibles are partially obscured by a small bubble. Contained within same amber piece as contains the Leptomyrmex ants, spider, muscoid and nematoceran flies, twig, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Dorsal view of spider, 2mm body length. Some of the enhydros have movable gas bubbles within their chambers. Contained within same amber piece as contains the Leptomyrmex ants, formicine ant, muscoid and nematoceran flies, twig, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight About 7mm long, this inclusion has a wood-like appearance, with interesting surface texture. The image does not fully capture the surface detail. A reddish partial abdomen and attached legs of some arthropod are present at the left end of the twig. Contained within same amber piece as contains the Leptomyrmex ants, formicine ant, spider, muscoid and nematoceran flies, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Lateral view of nematoceran fly (?Chironomidae), 1mm body length. Contained within same amber piece as contains the Leptomyrmex ants, formicine ant, spider, muscoid flies, twig, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Ventral view, 1.5mm body length; same individual as seen in related image. Contained within same amber piece as contains the Leptomyrmex ants, formicine ant, spider, nematoceran flies, twig, and enhydros.© Kaegen Lau
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From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight Lateral view, 1.5mm body length; same individual as seen in related image. Contained within same amber piece as contains the Leptomyrmex ants, formicine ant, spider, nematoceran flies, twig, and enhydros.© Kaegen Lau
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Leptomyrmex neotropicus (Dominican Amber)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
La Toca Mine Cordillera Septentrional Santiago Province, Dominican Republic La Toca Fm. (Mamey Group) 20.43-13.65 Ma Specimen: 7.7g / 51x21x12mm Equipment: Samsung Galaxy S9 Plus BelOMO 10x Triplet Loupe Quantum 140lm LED Penlight The piece containing these inclusions is absolutely loaded with different arthropods, but the most spectacular inclusions are those of a swarm of 11 extinct Leptomyrmex ants: there are 9 complete and 2 incomplete individuals, averaging 3.5mm in body length. In a lighthearted interpretation, it appears as though the duo in this image are performing some acrobatic act, while half of another individual gives audience! Other prominent inclusions consist of a twig (7mm), spider (2mm), formicine ant (3mm), two muscoid flies (1.5mm), two nematoceran flies (possible chironomid at 1mm, heavily decomposed mycetophilid at 3mm), and numerous enhydros.© Kaegen Lau
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I found this last weekend, but had it put aside until now. It is from the miocene marine outcrops of the Dahan River. Now, this is tiny--we are talking 2mm in diameter. It's something, it stands out among the rock. But I am not sure if it is an extremely small sea urchin or not. I hope the pictures help. It was tricky to take a picture of because of its size. It's small, circular, with tiny ridges on each side.
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- miocene
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Taxonomy from Gaudant 1994. The fossil cyprinid fish from the Dietrichsberg site were independently described as Palaeoleuciscus dietrichsbergensis by E. Böhme in 1993 and as P. cf. etilius by J. Gaudant in 1994. Description (Gaudant 1994, p. 225. Translated from French by oilshale): Fossil cyprinidae from Dietrichsberg are generally small fishes with standard lengths mostly between 35 and 70 mm, although the range of observed standard lengths varies from 17.5 to 85 mm. In addition, two isolated heads preserved in the Staatliches Museum für Mineralogie und Geologie zu Dresden are from individuals whose standard lengths can be estimated at 227 and 250 mm respectively (specimens S.M.M.G.D. - ThT 121 and - ThT 122). The body is relatively slender, its maximum height being generally included 4.5 to 5 times in the standard length. The head, whose length represents nearly a third (28 to 33%) of the standard length, is relatively large. The caudal fin is bilobed; its length is generally equal to 1/4 to 1/5 of the standard length.“ Line drawing (Gaudant 1994, p. 231): Identified by oilshale. References: Böhme, E. (1993) Eine Untermiozäne Fischfauna (Teleostei, Cyprinidae) vom Dietrichsberg bei Vacha/Rhön. Freiberger Forschungsheft C 450, Paläontologie, p. 116-140. Gaudant, J. (1994) Sur la présence du genre Palaeoleuciscus OBRHELOVÁ (Poissons téléostéens, Cyprinidae) dans le Miocene inférieur ou moyen (?) du Dietrichsberg, près de Vacha (Thuringe). Paläontologische Zeitschrift 68, p.223-243.
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Hello everyone, I've recently acquired this tooth from Indonesia. The seller mentioned it is a tiger tooth but they don't have more information. Does anyone on the forum know about indonesian fauna from the miocene-pliocene? do you think the tooth is real or fake? Many thanks in advance for your help. Kind regards, A.P
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Aurora North Carolina Megalodons, Makos, Giant Whites
fossil_lover_2277 posted a topic in Fossil Hunting Trips
Made a recent trip to Aurora, North Carolina to fossil hunt the Pungo River formation. These are the Megalodon, Giant White, and Mako teeth I found. Also the last pic shows the nicest tiger and sand tiger shark teeth I found. Not shown are several hundred identifiable whale and dolphins bones of decent quality, including intact vertebrae (atlas, axis, thoracic, lumbar, and caudal all found, some with processes), ribs, jaw bones, flipper bones (carpals and phalanges), sperm whale and dolphin teeth. Also found amber, petrified wood, Trionyx turtle shell, crab claws, and much more.
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VIDEO: Ethiopian Amber ("Tertiary Sediments", 23-16 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
Ethiopian Amber Wenchit River Valley North Shewa Zone, Amhara Region, Ethiopia “Tertiary Sediments” (23-16 Ma) Lighting: 140lm LED Longwave UV (365nm) Specimens: Spec. A (Marcasite): 11.2g / 27x20x31mm (in image) Spec. B (Large Yellow): 8.0g / 41x30x20mm Spec. C (Flow Lines): 8.4g / 34x31x20mm Spec. D (Run [Large Half]): 5.3g / 24x21x17mm Spec. E (Run [Small Half]): 2.8g / 23x19x14mm Spec. F (Green Flow): 5.7g / 26x25x20mm Spec. G (Green Angular): 3.1g / 27x20x15mm Spec. H (Umber [Large Half]): 3.3g / 26x18x17mm Spec. I (Umber [Small Half]): 2.2g / 22x12x12mm *With the exception of Specimens D and E, all present slight matrix on the exterior, consisting primarily of siltstone. Specimen A has a large cluster of iron sulfide mineral concretions on its rear side, accounting for the majority of the piece's weight. Mining, Properties: While there are several other amber and copal deposits on the African continent, Ethiopian amber deposits discovered back in 2010 have proven to be the most productive: on average, at least 20kg is mined by the locals every year. The amber is hard, and ranges in color from dark brown, red, and yellow, as well as varying shades of green; the green coloration is a natural base color, although a green fluorescence can be seen in some Ethiopian material when exposed to high-intensity LED light or sunlight: similar green fluorescent response is seen in some Dominican, Mexican, and Myanmar ambers. The green base coloration seen in some Ethiopian amber was likely caused by significant pressure and heat: volcanic layers of basalt of varying thickness overlie and underlie the deposits, and acted as a natural autoclave. The size of recovered amber specimens ranges anywhere from 5-25cm in size. Geology and Age of Deposits: Amber is found in sandstone and siltstone layers along the valley walls of the Wenchit, Jemma, and Mugher rivers; the amber-bearing layers were originally attributed to the Debre Libanos Sandstone, a Cretaceous geological Formation within the Blue Nile Basin 200-500m thick: this assignment was based on local observations, a geological map, and fossil spore identification. However, due to incorrectly-dated and some then-unidentified fossil spores, as well as arthropod and plant inclusions from genera with living relatives, the amber is believed to be Early Miocene in age. The amber occurs not in the Debre Libanos Sandstone, but in Tertiary sediments comprised of siltstone and sandstone situated between basalt layers, which often display columnar jointing. These basalt flows vary in age from Early Oligocene (~30 Ma) to Quaternary (2.58 Ma to Recent). Inclusions, Botanical Source: Ethiopian amber is frequently rich in inclusions, especially bacteria and fungal spores; plant inclusions include liverworts, various angiosperms, and rare examples of mosses and lichens; arthropods are abundant, including mites, spiders, and over 13 families of hexapods (e.g., beetles, flies, ants, etc.). Comparing the spectrographic results of Ethiopian amber with Dominican and Mexican ambers, has shown that this is a Class Ic resin, most likely produced by a member of the Fabaceae family; fossil leaves and flower parts of trees belonging to the Hymenaea genus have been found in this amber, adding weight to the chemical analysis’ findings. Sources: “A review of copal and amber occurrences in Africa and their paleontological significance.”; Bulletin de la Société géologique de France, 2020, 191 (1), p. 17; Valentine Bouju, Vincent Perrichot “On the ages of flood basalt events Sur l’âge des trapps basaltiques”; Comptes Rendus Geoscience, Volume 335, Issue 1, pp. 113-140; Courtillot, Renne 2003 “Stratigraphic and structural evolution of the Blue Nile Basin, Northwestern Ethiopian Plateau”; Geological Journal Issue 44, pp. 44, 47-50; N. Gani, et. al. 2008© Kaegen Lau
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Hey everyone! On my outings, I usually don't pick up the bone fragments, but I have stumbled upon a rather large pocket of good sized bone fragments that I would love some help in identifying. If no dice here, I'll get whatever is left ID'd at a museum this weekend. Fossil #1 - Going to take my best guess and say a rib of some sort? Fossil #2 Fossil #3 Fossil #4 And finally Fossil #5 There is PLENTY more where these came from, I consolidated the other fragments into a small area, so in the off chance anything here is significant, I would be more than happy to retrieve the rest. Thank you for any help you can provide, I know bone fragments are quite common at GMR, but I just found it odd to see so many chunks within close proximity.
![Dominican Amber (La Toca Fm. [Mamey Group], 20.43-13.65 Ma.)](http://content.invisioncic.com/e327962/monthly_2022_04/small.20220420_212338_resized_resized(1).jpg.7743a4a2a0e1a834bfb134b1544c0aaf.jpg)
