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Showing results for tags 'lower Jurassic'.
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Pyritized steinkern with shell remnants. This species is the index fossil for the margaritatus zone. Literature: Quenstedt, F.A. (1883-85): Die Ammoniten des Schwäbischen Jura. Bd.1 Der Schwarze Jura (Lias). Schweizerbart'sche Verlag.
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- a5a
- amaltheus margaritatus
- (and 5 more)
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Index fossil for zone and subzone. Also known as Harpoceras falciferum. Literature: Howarth, M.K. (1973): The Stratigraphy and Ammonite Fauna of the Upper Liassic Grey Shales of the Yorkshire Coast. Bulletin of the British Museum (Natural History) Geology. Vol.24 No.4 Howarth, M.K. (1992): The Ammonite Family Hildoceratidae in the Lower Jurassic of Britain. Monograph of the Palaeontographical Society.
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- thouars
- lower toarcian
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This species gives its name to the zone and subzone at the bottom of the lower Toarcian. This very fine-ribbed specimen of the genus Dactylioceras is for me a fine representative for the legend of St. Hilda, the Abbess at the monastery in Whitby ca. 650 A.D. She wanted to build a convent there as well, but the grounds were infested with snakes, so she prayed so intensively that all of the snakes were turned into stone. Since then they are known as snakestones. I found this sample pretty well as is with a head that reminds us of a snake. Literature: Howarth, M.K. (1973): The Stratigraphy and Ammonite Fauna of the Upper Liassic Grey Shales of the Yorkshire Coast. Bulletin of the British Museum (Natural History) Geology. Vol.24 No.4
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- lower jurassic
- tenuicostatum zone
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This sample still has a white substance covering it which is original shall material. This is the index fossil for the apyrenum subzone. Old German Chronostratigraphy: Lias (Schwarzjura) delta Literature: Simonsen,S. et al (2012): Die Tongrube Buttenheim, 2. überarbeitete Auflage, Verlag Der Steinkern
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Remnants of the original aragonite shell were still on this fossil when found, but they were removed in order to expose the pyritized steinkern mold. The overwhelming majority of the fossils at Buttenheim show this type of preservation, although pure or partial calcite molds also occur. This is also the index fossil for the solare subzone, which is only recognized in Germany. For information on identification of this species see Pleuroceras spinatum under Collections. Old German Chronostratigraphy: Lias (Schwarzjura) delta Literature: Simonsen,S. et al (2012): Die Tongrube Buttenheim, 2. überarbeitete Auflage, Verlag Der Steinkern
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- 1
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- germany
- buttenheim
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The last three photos show a specimen from the Whitby Mudstone Formation in Yorkshire in pyrite conservation. The diagnosis for distinguishing this species from D.commune, which is quite similar, can be found in the collection here under that species. Literature: Howarth, M.K. (1973): The Stratigraphy and Ammonite Fauna of the Upper Liassic Grey Shales of the Yorkshire Coast. Bulletin of the British Museum (Natural History) Geology. Vol.24 No.4
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This species was one of the most common of its time, but nevertheless it is used as the index fossil for the subzone since its occurence is practically limited to it. It is not easy to differentiate it from the species D.athleticum, which occurs in the same subzone. One main difference is that D.commune has a more rounded whorl section than D.athleticum, which is more oval. Another is that the number of ribs per whorl by D.athleticum remains constant, whereas D.commune has less ribs on the outer whorls as on the inner ones. The first specimen is from France (4 photos), the next 2 photos show a pyritized version in a concretion from a site near Whitby, Yorks., UK as well as the cut and polished version in the last photo. Both come from the Whitby Mudstone Formation. It's always interesting to observe how the same species can be preserved so differently depending in the particular conditions under which they were fossilized. Literature: Howarth, M.K. (1973): The Stratigraphy and Ammonite Fauna of the Upper Liassic Grey Shales of the Yorkshire Coast. Bulletin of the British Museum (Natural History) Geology. Vol.24 No.4
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- 1
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- dactylioceras commune
- lower toarcian
- (and 7 more)
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This specimen is missing part of the body chamber, but it displays very well nevertheless what size the shell of this ammonite had reached. This is the index fossil for the European bifrons zone. Literature: Rulleau, L. (1979): Geologie et Paleontologie des Carrières Lafarge à Belmont (Rhone), Section Geol. d. Comité d'Entreprise de l'usine du Val d'Azergues Howarth, M.K. (1992): The Ammonite Family Hildoceratidae in the Lower Jurassic of Britain. Monograph of the Palaeontographical Society.
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- hildoceras bifrons
- toarcian
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This is the index fossil for the variabilis zone, the lowermost biozone of the European Toarcian. Literature: Rulleau, L. (1979): Geologie et Paleontologie des Carrières Lafarge à Belmont (Rhone), Section Geol. d. Comité d'Entreprise de l'usine du Val d'Azergues Howarth, M.K. (1992): The Ammonite Family Hildoceratidae in the Lower Jurassic of Britain. Monograph of the Palaeontographical Society.
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- upper toarcian
- france
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This is the index fossil for the fallaciosum subzone. Literature: Rulleau, L. (1979): Geologie et Paleontologie des Carrières Lafarge à Belmont (Rhone), Section Geol. d. Comité d'Entreprise de l'usine du Val d'Azergues Rulleau, L. (2001): Les Grammoceratinae du Toarcien Superieur de la Region Lyonaisse, SectionGeol.d.Comité d'Entreprise de l'usine du Val d'Azergues Howarth, M.K. (1992): The Ammonite Family Hildoceratidae in the Lower Jurassic of Britain. Monograph of the Palaeontographical Society.
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- a733
- lower jurassic
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A nest of 5 specimens, the largest of which has a diameter of 6cm. The whole thing measures 10x8x4cm. Index fossil for its zone. Literature: Howarth, M.K. (1992): The Ammonite Family Hildoceratidae in the Lower Jurassic of Britain. Monograph of the Palaeontographical Society.
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A 2.3 cm long Steneosaurus tooth from the quarry Kromer in Holzmaden (Germany).
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- lower jurassic
- steneosaurus
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From the album: Holzmaden
A 11 cm long, thick Passaloteuthis paxillosa from the lower Jurassic in Holzmaden (Germany).-
- passaloteuthis paxillosa
- holzmaden
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From the album: Holzmaden
A 0.6 cm long, very spherical Ichtyosaurus tooth from the lower Jurassic in Holzmaden (Germany).- 2 comments
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- ichtyosaurus
- tooth
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From the album: Holzmaden
A damaged 1.3 cm long Steneosaurus tooth from the lower Jurassic in Holzmaden (Germany).-
- holzmaden
- lower jurassic
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From the album: Holzmaden
A 13.5 cm long Youngiblus (?) from the quarry Kromer in Holzmaden, Early Toarcian (Lower Jurassic).-
- Holzmaden
- Youngibelus
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From the album: Holzmaden
A 4 cm long Dactylioteuthis from the quarry Kromer in Holzmaden (Germany), Lower Jurassic-
- Dactylioteuthis
- Holzmaden
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From the album: Holzmaden
A 16 cm long Youngibelus from the quarry Kromer in Holzmaden (Germany), Lower Jurassic-
- Youngibelus
- Holzmaden
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From the album: Holzmaden
Three Passalotheuthis on a 25 cm long stone from Holzmaden. The longest belemnit is about 9 cm long.-
- Passalotheuthis
- Holzmaden
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From the album: Holzmaden
A 0.6 cm long Ichtyosaurus tooth from the quarry Kromer in Holzmaden (lower Jurassic).-
- Ichtyosaurus
- Tooth
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From the album: Holzmaden
1 cm long tooth (Stenopterygius) from the quarry Kromer in Holzmaden.-
- Stenopterygius
- Holzmaden
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From the album: Holzmaden
A 2.3 cm long Steneosaurus tooth from the lower Jurassic in Holzmaden.-
- Tooth
- Steneosaurus
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From the album: Holzmaden
Onychites (3.2 cm long) Holzmaden lower Jurassic-
- Oynichites
- Holzmaden
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From the album: Holzmaden
Detailed picture of: http://www.thefossil...osuchian-tooth/-
- Thalattosuchian tooth
- Holzmaden
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From the album: Holzmaden
A thalattosuchian tooth from the lower Jurassic in Holzmaden. Size: ca. 5 mm EDIT: I destroy this tooth while prepping-
- thalattosuchia tooth
- Holzmaden
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