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Showing results for tags 'shirbuirnia'.
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This time around I chose another of my favorite Ammonites from Dorset for the model. It's a Shirbuirnia trigonalis from the Early Bajocian laeviuscula zone from Sherborne, Dorset. This took a while trying to get all the sutures right.
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From the album: Middle Jurassic Ammonites from Southern Germany
ø35cm. laeviuscula zone, Early Bajocian, Wedelsandstein Formation Found in the Wutach area With a Chlamys textoria perched at the edge of the living chamber in the photo below.-
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I recently recieved a large Ammonite from the Wutach Valley for preparation from a customer. It was a bit of a task since the thing is so huge with a diameter of 50cm. (1ft.7in.). First of all I had to remove the excess matrix with hammer & chisel. I didn't photograph it beforehand, but here is how it looked afterwards. As you can see, the living chamber was extracted in 2 extra pieces which still needed to be attached. The phragmocone alone has a diameter of over a foot and there is still a piece of living chamber missing at the end where the brown color can be seen at the top. I didn't glue them back on at first, but concentrated rather on stylus and abrader work on the phragmocome. The next photo shows it at that stage with the 2 living chamber pieces just placed next to it. I then abraded the living chamber pieces, removed the unseemly brown layer on the phragmocone and glued it all back together with a strong adhesive which then cured for 24 hours. The next step was to fill the gaps with modelling clay (I use a product called Apoxie Sculpt) and finish off with water color paints and a beeswax finish. I couldn't get the color quite right, so I left that last step to my customer's wife who did an excellent job. Here's the end product:
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Just missing half of the body chamber.
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From the album: Cephalopods Worldwide
17cm. From the laeviuscula zone, trigonalis subzone at Sherborne, Dorset, UK. -
From the album: Cephalopods Worldwide
17cm. Trigonalis subzone, laeviuscula zone, lower Bajocian, Middle Jurassic. From Sherborne, Dorset, UK. -
The colors come from the iron in the neighborhood. One can distinctly see the transition from phragmocone to body chamber. This is the index fossil for the subzone.
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From the album: Cephalopods Worldwide
9cm. From the trigonalis subzone, of which it is the index fossil, laeviuscula zone, lower Bajocian. Found at Sherborne Dorset, GB.