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Some New Aquisitions


Ludwigia

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I was recently asked by a specialist on Middle Jurassic ammonites to do some preparation work for him. In exchange for the work he has given me a good number of unprepared ammonites from his collection, many of which are from sites with species which I don't yet have represented in my collection. So I decided to split the work: one for him and one for me. Here are the first ones. I'll be posting more of them here as I get them done.

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A small multiblock (11x8x4cm.) with Leioceras comptum.

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Leioceras lineatum. 10cm. I could have chopped off the last bit to make it look better, but it may be that this break was caused by predation, so I decided to leave it the way it is out of interest.

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Brasilia geisingensis. 17cm. Calcite mold with nice sutures. This is a new species from the Geisingen clay pit.

 

Greetings from the Lake of Constance. Roger

http://www.steinkern.de/

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Well, I've prepped another 3 for my friend, so I figured it was time to do another one for myself. This time it's a 23cm. Sonninia sp. from Burton Bradstock, Dorset.


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Greetings from the Lake of Constance. Roger

http://www.steinkern.de/

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Very Nice, thanks for sharing the images,

Just a quick question or 2,

How long did it take you to prep the 1st image?

Do you prefer your finished prep to be in or on matrix?

Regards

Mike

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Very Nice, thanks for sharing the images,

Just a quick question or 2,

How long did it take you to prep the 1st image?

Do you prefer your finished prep to be in or on matrix?

Regards

Mike

Thanks, Mike. I didn't time it exactly, but I think it took about 2 hours. Here's what it looked like before prep. Bottom left:

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I actually don't have a preference. There are however a few deciding factors. Aesthetics play a big roll. Sometimes I want to expose both sides of the fossil, which necessitates removing a lot of matrix. Normally, I like to keep them on the matrix, whichever way it turns out. I generally only dig them out completely when there's too little matrix or it doesn't present itself well no matter how you look at it. Also for studies it's good to have both sides available.

 

Greetings from the Lake of Constance. Roger

http://www.steinkern.de/

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I had sort of a prep marathon yesterday. Selected some ammonites that my friend had already mostly prepared and just had to put the finishing touches on them. All of them are from Burton Bradstock again.

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Both are Leioceras sp. 15 & 12cm.

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These two are Oppelia sp. 10 & 7cm.

 

Greetings from the Lake of Constance. Roger

http://www.steinkern.de/

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Wow thanks for the answers, some of my prep takes 8 to 10 Hrs what am I doing wrong?

I prefer them with the matrix in place but love the naked ones just as much.

Regards

Mike

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Wow thanks for the answers, some of my prep takes 8 to 10 Hrs what am I doing wrong?

I prefer them with the matrix in place but love the naked ones just as much.

Regards

Mike

Mike, I'm sure you're doing nothing wrong. Perhaps my airpens are more powerful than yours and my air abrader can get up to over 100psi with no great difficulty. The Whitby concretions that you generally are working on are also much harder than the matrix on the piece you asked about.

Love Bajocian ammos... :)

Me too :D

 

Greetings from the Lake of Constance. Roger

http://www.steinkern.de/

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Thanks Ludwigia, I only have 1 air pen and will be getting an air abrader for xmass, my air pen is a Chicago model that I have been using for about a year, I am looking at getting one of Ken Manions air pens but they are a bit expensive for me at the moment.

The matrix that all of my fossils are in is very hard I have noticed that some of the forum members use manual picks and needles to do prep work and I got some of these when I first started to prep but all they did was scratch the surface, (took me about 3 hrs to remove 1 mm of matrix and I nearly gave up)

Regards

Mike

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Wow, they're very nice Roger! Good work! : )

Every once in a great while it's not just a big rock down there!

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Thanks Ludwigia, I only have 1 air pen and will be getting an air abrader for xmass, my air pen is a Chicago model that I have been using for about a year, I am looking at getting one of Ken Manions air pens but they are a bit expensive for me at the moment.

The matrix that all of my fossils are in is very hard I have noticed that some of the forum members use manual picks and needles to do prep work and I got some of these when I first started to prep but all they did was scratch the surface, (took me about 3 hrs to remove 1 mm of matrix and I nearly gave up)

Regards

Mike

Yes, you do need some instruments with some brisance and power in order to make a dent in those concretions.

Wow, they're very nice Roger! Good work! : )

Thank you!

Here's another one from Burton Bradstock:

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Prorsisphinctes sp. 13cm.

 

Greetings from the Lake of Constance. Roger

http://www.steinkern.de/

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I was busy doing a couple of tough ones for my friend the last few days, but today I got around to completing this 20cm. Ludwigia sp. from Horn Park, Dorset.

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Greetings from the Lake of Constance. Roger

http://www.steinkern.de/

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I was busy doing a couple of tough ones for my friend the last few days, but today I got around to completing this 20cm. Ludwigia sp. from Horn Park, Dorset.

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Nice!

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