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piesandbeer

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Cambrian Rockhound
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Reply with quote  #1 
Hi all,

Managed to get down to Pett Level a couple of times a few weeks ago, Seemed to be a lot of pieces of bone bed about.  Filled up my rucksack, and I've been bashing, dissolving and sifting on and off ever since.

Have attached a few photos, I'd be interested to know if anyone has any opinions on this first Fossil. I was wondering if it might be a Pterosaur tooth? (The long one obviously)

20180807_231119.jpg 
Close Up:

20180621_204851.jpg 
Presume this is turtle carapace:
20180807_230051.jpg 
Smaller pieces of turtle
20180807_230742.jpg  Various croc, fish and shark Teeth

20180807_231238.jpg  20180807_231416.jpg  20180807_233317.jpg  20180807_233746.jpg 
Larger Shark tooth?
20180807_231631.jpg 

 Various bone fragments

20180807_233131.jpg  20180807_231710.jpg 
Also discovered this amongst some teeth I had found in some bone bed a couple of years ago. Hadn't noticed the serrations until now.  Small Dino tooth? (Length is approx. 5mm)
20180606_181737.jpg

Still some more bubbling away in jars!  

Mark

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s.c.

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Reply with quote  #2 
Some nice finds there Mark!

Sam
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Weald on Bed

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Reply with quote  #3 
Very impressive - certainly looks like a Pterosaur Ptooth to me. 


Despite several attempts, I've never had much luck disaggregating bone bed samples. I found the soak-freeze-thaw tended to break up the fossils as readily as it did the matrix whereas glacial acetic acid (at 5%) just took forever to eat through it. Also made me crave fish & chips every time I checked on progress... Without giving away any trade secrets, would you be willing to share some tips? 
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piesandbeer

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Thanks Both,

A Pterosaur Ptooth - Pterrific!😀
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piesandbeer

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Reply with quote  #5 
Weald, quite happy to explain what I did, but I don't think I've any great revelations to make I'm afraid. It was, in the most part, repeatedly hitting everything with a club hammer...!

So, started by gradually breaking the bits of bed down into smaller and smaller pieces with a hammer, if I noticed anything of interest I'd expose further with an air pen. Then put the resulting small bits of bone bed into dilute acetic acid (bought at 80%, diluted 1 part acid to 2 parts water which I guess  makes it around 25% - anything less than this doesn't seem to have much effect) after 2-3 weeks I had quite a bit of disaggregated material which I then drained through some tights, rinsed, left to dry out then sifted by hand. soaked anything I'd sifted out in water for a couple to days to get rid of any left over acid.

I've come to the conclusion that whatever method you use you are going to lose some fossils...
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