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Showing results for tags 'aalenian'.
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Calcite mold. Complete specimen with a smaller one attached.
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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
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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.- 7 comments
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From the album: Middle Jurassic Ammonites from Southern Germany
Not quite identical twins measuring 16 & 18cm. bradfordensis zone, staufensis bank Late Aalenian From the Wutach Valley -
From the album: Sketches
Original found in the Wutach Valley, Baden-Wuerttemberg, Germany. Sinon bank, murchisonae zone, Late Aalenian, Middle Jurassic Achdorf Formation. -
From the album: Middle Jurassic Ammonites from Southern Germany
9cm. Murchisonae Zone, Upper Aalenian, Middle Jurassic. Found in the Wutach area. This is the index fossil for this particular zone. -
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.- 4 comments
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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
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
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.-
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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
4.5cm. From the Murchisonae Zone in the Wutach Valley. Upper Aalenian.- 2 comments
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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.-
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From the album: Middle Jurassic Ammonites from Southern Germany
11cm. Murchisonae Zone, Upper Aalenian. Found in the Wutach area.- 2 comments
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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.-
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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. -
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.- 4 comments
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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.-
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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
10cm. Practically complete specimen with shell preservation. Just missing a few millimeters at the mouth aperture. murchisonae zone Late Aalenian Found in the Wutach Valley- 1 comment
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From the album: Middle Jurassic Ammonites from Southern Germany
9.5cm. haugi subzone murchisonae zone sinon banks Late Aalenian Achdorf Formation Found in the Wutach Valley. -
From the album: Middle Jurassic Ammonites from Southern Germany
14cm. in circumference. Another one from Wutach. Upper Aalenian. -
A few of my ammonites collected from the Inferior Oolite at both coastal and inland quarry sites in Dorset, UK.
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I recently recieved a very interesting block with two ammonites of the same species to prepare on commission which I would like to show you here. They lay about 10 cm. apart one over the other, so either they were imbedded at different times or else they reached their final positions through turbulence. Staufenia staufensis is the species, one having a diameter of 18cm. and the other one of 16. They come from the Middle Jurassic bradfordensis zone of the Late Aalenian. I'll show you the progression of the preparation using 4 blocks of 4 photos each showing different perspectives of the block. The first thing I did was to rid the block of as much excess matrix as possible with hammer and chisel, but I didn't think to take photos of the original, so the first photos to be seen are the ones taken after that. Below is the state after a few hours of work with the styluses. It's starting to get into shape now. Then I spent the next few hours abrading and fine-tuning the shape with the styluses, rocking back and forth between the two as necessary. ...Looks like I'm going to have to make another post...
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Hello everyone, I have a question regarding stabilising sandstone to keep it from crumbling. Last year I found and extracted a dinosaur footprint from a block on the beach at Whitby, Yorkshire UK. The footprint is of an Aalenian age therapod from approximately 170 million years ago. The print itself measures 20cm from the base to the tip of the centre claw mark. I am hoping to get the block it is in cut down into a slab in order to frame it but now that it is dry the sandstone is very loose and crumbly. I am looking for something that will add strength to the stone and prevent crumbling without significantly changing the colour of the stone or adding a shiny finish as I would like the finished piece to remain as close as possible to how it was, just stronger. I was hoping somebody would have an idea what would be best to soak the block with in order to keep it from falling apart. Any and all suggestions are greatly appreciated. Thank you, Benton Walters