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Showing results for tags 'pseudoshirbuirnia'.
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Collected in 3 pieces and repaired.
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Pseudoshirbuirnia oechslei (Dietze et al 2005)
Ludwigia posted a gallery image in Member Collections
From the album: Middle Jurassic Ammonites from Southern Germany
30cm. ovale zone Early Bajocian Wedelsandstein Formation From the Wutach area-
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My customer/friend, let's just call him X. for now, brought me another large ammonite which he had recently pryed up for prep. He got this one out in 3 pieces, 2 of which he glued back together. The ammonite itself has a diameter of 30cm. Here's what I was faced with to begin with (Well almost. I took the pics after I had started in with the stylus.) The 1st pic shows them side by side, the 2nd in original position and the 3rd the reverse side. S. first had the wish that I remove it completely from the matrix, but I wasn't so sure about the chances of success there. For one thing, there were a lot of cavities in the phragmocone, and due to the hardness of the matrix, there was a good chance of breakage under way. There was also a heckuva lot of matrix above and below the fossil, so I knew that this was going to take a loooong time, even with the strong jack stylus. I decided to get started with the larger block and set aside the smaller one for the time being. After a few hours of plugging away with the air pen, it also became obvious that there was no proper separating layer between matrix and fossil, which made for even more time consumption and finesse. Here's how both sides looked at that point. I then decided that it was time to swap over to the air abrader, since I wasn't quite certain how the lay of the land was. There were a lot of oysters and tube worms clinging to the shell which made it difficult in some places to make a judgement as to where the ammonite shell actually started. As you can see in the next two photos, I continued on with the stylus after the abrading was done. 2nd pic in next post.
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