Search the Community
Showing results for tags 'aalenian'.
-
This is the index fossil of the concavum zone. Most of the shell is preserved, as is a small portion of the body chamber. These ammonites could reach a good size, as shown by the sample in the last 2 photos, which has a circumference of 21cm. Lithography: Geisingen-Oolith The Geisingen-Oolith is a horizon which was built and reworked over a long stretch of time at the coastal fringe of an arm of the Tethys ocean. Fauna from both the concavum and the bradfordensis zones are to be found in it. Old German Chronostratigraphy: Dogger (Braunjura) beta Literature: Dietze et al (2014): Aalenian (Middle Jurassic) ammonites and stratigraphy of the Geisingen clay pit (SW Germany). Palaeodiversity 7: 61-127
-
This is the index fossil of the murchisonae zone. This sample was disturbed either during burial or later tectonically at the point where the phragmocone meets the body chamber. The shell is completely preserved on one side showing clearly the typical ribbing. It is not quite complete, still missing about a half turn around the axes. Old German Chronostratigraphy: Dogger (Braunjura) beta Literature: Rieber,H. (1963): Ammoniten und Stratigraphie des Braunjura beta der Schwaebischen Alb, Palaeontographica Bd.122,Abt.A, Pp.1-89
-
This species has long been a subject of contention as to its lineage, but Dietze (2014), following the chronospecies/genus concept, has managed to prove to the satisfaction of most that it belongs to the subfamily of the Leioceratinae. Rieber (1963) had placed it in the subfamily Staufeniinae and had named it Staufenia opalinoides, a name which most collectors and paleontologists adopted, since his work was the most comprehensive one on the ammonite fauna of the area for many years. This almost complete specimen has most of its shell intact. The band of variation of ribbing and other sculptural factors is relatively broad, but this here is a typical sample. Biostratigraphy: Murchisonae Zone, Sinon Bank 1, haugi Subzone Old German Chronostratigraphy: Dogger (Braunjura) beta Literature: Rieber,H. (1963): Ammoniten und Stratigraphie des Braunjura beta der Schwaebischen Alb, Palaeontographica Bd.122,Abt.A, Pp.1-89 Dietze et al (2014): Aalenian (Middle Jurassic) ammonites and stratigraphy of the Geisingen clay pit (SW Germany), Palaeodiversity 7: 61–127 Horn,E. (1909): Die Harpoceraten der Murchisonae-Schichten des Donau-Rhein-Zuges, Mitteilungen der Großh. Badischen Geologischen Landesanstalt, VI. Bd.1.Heft
-
To be seen on the matrix below the ammonite are 2 Myophorella formosa bivalves on the right and a Staufenia opalinoides ammonite. The shell on one side is completely preserved. The other side shows the calcite mold with sutures on the phragmocone. Only a small section of the body chamber on this specimen is preserved. If complete, it would probably have had a diameter of approximately 16cm. This is the index fossil of the subzone. Old German Chronostratigraphy: Dogger (Braunjura) beta Literature: Rieber,H. (1963): Ammoniten und Stratigraphie des Braunjura beta der Schwaebischen Alb, Palaeontographica Bd.122,Abt.A, Pp.1-89
-
From the album: Middle Jurassic Ammonites from Southern Germany
Ditto to the previous photo. -
From the album: Middle Jurassic Ammonites from Southern Germany
There are 7 Ancolioceras opalinoides ammonites on this block, the largest having a diameter of 9cm. and the smallest one of 2cm. Found in the upper Aalenian murchisonae Zone in the Wutach Valley. -
From the album: Middle Jurassic Ammonites from Southern Germany
9,5cm. Wutach Valley find. Upper Aalenian. -
From the album: Middle Jurassic Ammonites from Southern Germany
14cm. in circumference. Another one from Wutach. Upper Aalenian. -
From the album: Vertebrates (other than fish)
Crocodile. Back part of the lower jawbone. Found at the clay pit in Geisingen. Aalenian, Geisingen Oolith. The creature was extrapolated to be at least 7 meters long, one of the largest ever found world wide in these layers. Currently in the collection at Tuebingen for research. Update Aug.2020: I've now reassigned this to Glaphyrorhynchus aalensis with a question mark according to the most recent revisions. The above photo is of the original, the two below are of the cast. -
Ludwigia (Pseudographoceras) umbilicata (Buckman 1905)
Ludwigia posted a gallery image in Member Collections
From the album: Middle Jurassic Ammonites from Southern Germany
6.5cm. From the upper Aalenian in the Wutach area. -
From the album: Decapoda
5cm. long. Needless to say I'm happy with this little crab chela. It's not every day that a new species gets named after yourself. Found in September 2012 on a lucky split in the upper Aalenian layers at the Scheffheu location in the Wutach valley. Achdorf Formation, bradfordensis zone, staufensis bank. It's now residing in a holotype cabinet in the collection at the Stuttgart Museum of Natural History. I have received a mold of it for posterity.- 4 comments
-
- 3
-
-
-
- aalenian
- stenodactylina
- (and 1 more)
-
Ludwigia (Ludwigia) bradfordensis deleta (Buckman 1899)
Ludwigia posted a gallery image in Member Collections
From the album: Middle Jurassic Ammonites from Southern Germany
7.5cm. From the Wutach Valley. Staufensis bank, Achdorf Formation, upper Aalenian. -
From the album: Middle Jurassic Ammonites from Southern Germany
9cm. The shell is weathered in such a way that the sutures are good to observe. This appears to be a form between Staufenia and Ludwigia, but it has more of the former about it than the latter. Found in the Staufensis Bank, upper Aalenian in the Wutach valley. These were assigned to the genus Staufenia by Rieber in 1963, but Dietze, Rieber etal have revised the genera in December 2014 to the above. -
From the album: German Gastropods and Bivalves
7cm. wide. Found in the upper Aalenian layers at Geisingen. -
Assemblage with Ludwigia latecostata and Ancolioceras opalinoides.
Ludwigia posted a gallery image in Member Collections
From the album: Middle Jurassic Ammonites from Southern Germany
L.latecostata bottom right. The others are A.opalinoides. The size of the block is 21x20x7cm. From the Upper Aalenian, Murchisonae Zone in the Wutach area. This block now resides in Virginia. -
From the album: Middle Jurassic Ammonites from Southern Germany
4.5cm. From the Murchisonae Zone in the Wutach Valley. Upper Aalenian. -
Ludwigia (Pseudographoceras) umbilicata (Buckman1899)
Ludwigia posted a gallery image in Member Collections
From the album: Middle Jurassic Ammonites from Southern Germany
3cm. Another one from the Wutach. Upper Aalenian, Bradfordensis Zone. -
From the album: Middle Jurassic Ammonites from Southern Germany
12cm. in circumference. Another one from the Wutach. Upper Aalenian. I found this one a long time ago before I knew any better and unfortunately almost destroyed the living chamber before I realized what I was doing. Haven't found any more of this species since then though, so it's still in the collection. PS in Dec.2012. I've just changed the ID from S.discoidea to S.sehndensis. We've just discovered that this is only the second of its kind identified in the Wutach area. -
From the album: Middle Jurassic Ammonites from Southern Germany
11cm. Murchisonae Zone, Upper Aalenian. Found in the Wutach area. -
From the album: Middle Jurassic Ammonites from Southern Germany
9cm. From the Sinon Bank in the Wutach area. Murchisonae Zone, Upper Aalenian. It broke into 2 pieces as I was getting it out. Can you see where I repaired it? These were assigned to the genus Staufenia by Rieber in 1963, but Dietze, Rieber etal have revised the genera in December 2014 to the above. -
From the album: Middle Jurassic Ammonites from Southern Germany
7cm. Bradfordensis-Zone, Upper Aalenian, Middle Jurassic. Quenstedt called these layers Dogger beta. Found in the Wutach area. Another calcitized mold with a bit of shell left. -
From the album: Middle Jurassic Ammonites from Southern Germany
11cm. Murchisonae Zone, Upper Aalenian, Middle Jurassic. Wutach Valley. This one has almost completely lost its shell revealing the calcified mold showing the suture lines of the phragmacon. These were assigned to the genus Staufenia by Rieber in 1963, but Dietze, Rieber etal have revised the genera in December 2014 to the above. -
From the album: Middle Jurassic Ammonites from Southern Germany
9cm. I found this one very early in my collecting "career" and botched the hand preparation somewhat - there are lots of scratches on it - but I've kept it all this time since it's somewhat of a rarity for these parts. Also the glimpse in the chambers is nice. Found in the Wutach Valley in the Staufensis Bank of the Upper Aalenian, Middle Jurassic. -
From the album: Middle Jurassic Ammonites from Southern Germany
9cm. This species gives its name to the Staufensis Bank, which appears in certain sections of the Bradfordensis Subzone of the Murchisonae Zone, Upper Aalenian, Middle Jurassic. It is quite common to find them in the Wutach area, but the stone is so hard and the discus-shaped ammonites so fragile, that it's difficult to extricate a well-preserved specimen without damageing it in some way. This one lost much of its shell, exposing the impressions of the sutures on the calcite core and also giving a view into the crystallized chambers of the phragmocon. -
From the album: Middle Jurassic Ammonites from Southern Germany
5cm. A very fine-ribbed species from the so-called Staufensis Bank in the Murchisonae Zone in the Wutach area. Upper Aalenian, Middle Jurassic.
