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Showing results for tags 'bajocian'.
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Sonninia (Euhoploceras) marginatum (Buckman 1892)
Ludwigia posted a gallery image in Member Collections
From the album: Cephalopods Worldwide
8cm. Phragmocone with most of the shell preserved. From the Bajocian discites zone at Bradford Abbas, Dorset, UK. -
Phragmocone mold with some shell remnants. Type locality and horizon for this species.
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A good portion of the shell is preserved on the calcite mold. Just the phragmocone from what was a large specimen.
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Phragmocone with half a whorl of body chamber.
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Some shell is intact.
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The shell is intact on one side. Phragmocone with half of the body chamber. Literature: Dietze etal. 2005, The ammonite fauna and biostratigraphy of the Lower Bajocian (Ovale and Laeviuscula zones) of E Swabia (S Germany), Stuttgarter Beitr. Naturk. Ser. B Nr. 353
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From the album: Cephalopods Worldwide
17.5cm. This is just the phragmocone, so it was quite a large animal. From the Bajocian humphresianum zone at Frogden quarry,Sherborne, Dorset, England. Type locality and horizon for this species. -
Cadomites (Cadomites) deslongchampsi (D'Orbigny 1846)
Ludwigia posted a gallery image in Member Collections
From the album: Cephalopods Worldwide
7.5cm. Calcite mold with parts of the shell intact. From the Bajocian niortense zone at Frogden quarry, Dorset, England. -
This ammonite is complete with the exception of the missing section of whorl at the aperture. The fine spines are visible on the flank.
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Stephanoceras (Skirroceras) leptogyrale (Buckman)
Ludwigia posted a gallery image in Member Collections
From the album: Cephalopods Worldwide
7.5cm. Calcite mold with parts of the shell intact. From the lower Bajocian sauzei zone at Sherborne, Dorset, England. The zone is locally named the propinquans zone. -
Found on a plowed field. Calcite mold of part of the phragmocone.
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Found on a plowed field. The shell on the phragmocone is preserved. Index fossil for the romani subzone.
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One of the best preserved and complete ammonites I have ever found. The shell is perfectly intact as well as the lappets. This is the microconch to Stephanoceras sp.
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With most of the shell intact. Still far from complete at this size.
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Bigotites (Prorsisphinctes) pseudomartinsi (Siemiradszki 1899)
Ludwigia posted a fossil in Ammonoids
This specimen was found on a plowed field. It is practically complete with well-preserved shell. A small portion of the venter on the outer whorl between 1 & 3 o'clock was missing and was restored with modelling clay and touched up with water colors. Tube worms and oysters settle on the inner whorls of the reverse side, probably after death and deposition, which indicates which side was up on the ocean floor. -
Leptosphinctes (Cleistosphintes) ex. gr. althoffi (Wetzel)
Ludwigia posted a gallery image in Member Collections
From the album: Middle Jurassic Ammonites from Southern Germany
8cm. in diameter. Found on a plowed field near Geisingen. Tetragona subzone, garantiana zone, Bajocian. -
Found in a discarded block at the edge of a plowed field. Index fossil for the tetragona subzone.
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Garantiana (Hlawiceras) aff. tetragona (Wetzel 1911)
Ludwigia posted a gallery image in Member Collections
From the album: Middle Jurassic Ammonites from Southern Germany
9cm. in diameter. Found on a plowed field near Geisingen. Index fossil for the tetragona subzone, garantiana zone, Bajocian. -
From the album: Middle Jurassic Ammonites from Southern Germany
I'm sure of the genus, but not the species. 2.5cm. in diameter. Found on a plowed field near Talheim Probably humphresianum Zone, Bajocian. Extremely rare and well-preserved specimen.-
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The quality of preservation of the fossils at this world famous site is outstanding. This sample is practically complete, just missing the last portion of the body chamber. It gives its species name to both the lithographical unit and the zone. Lithography: Parkinsonien-Oolith Old German Chronostratigraphy: Dogger(Braun Jura) delta Literature: Callomon et al (1987): Zur Stratigraphie des Mittel- und unteren Oberjuras in Sengenthal und Neumarkt/Opf. (Fränkische Alb). Stgt. Beitr. B132 Schmidt-Kaler et al (1992): Wanderungen in die Erdgeschichte: Sulzkirchen & Sengenthal. Verlag Dr. Friedrich Pfeil.
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Lithography: "Humphresie-Bank/Schichten" Old German Chronostratigraphy: Dogger(Braun Jura) delta This ammonite is the index fossil for its zone. It has an anomaly which can clearly be seen on the outer whorls at 9 o'clock. The external side is then exposed more than usual until it returns to normal at 3 o'clock. The small remnant of shell from the outer whorl of the body chamber from thereon shows how large the ammonite actually was. Literature: Ottiger,R. (2014): Fossiliensuche im Tafeljura. Verlag Dr. Friedrich Pfeil. Burkhalter,R.M. (1996): Die Passwang Alloformation im zentralen und noerdlichen Schweizer Jura. Eclogae geol. Helv. 89/3: 875-934.
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Old German Chronostratigraphy: Dogger(Braun Jura) delta This specimen represents the stratigraphically oldest record of the genus Emileia in Germany and one of the oldest records worldwide (Dietze el al. 2008). Donated to the Stuttgart Museum for Natural History (SMNS #67602) Literature: Dietze et al, (2010): Rare Middle Jurassic ammonites of the families Erycitidae, Otoitidae and Stephanoceratidae from southern Germany. Zitteliana A50, 71-88. Ohmert, W. (1988): The Ovalis Zone (Lower Bajocian) in the type area, Southwestern Germany. – In: R. B. rocha & a. f. SoareS (Eds), 2nd International Symposium on Jurassic Stratigraphy, Lisbon, 255–268.
