Re: conodont removal

[H.A.Armstrong@xxxxxxxxxxxx (Howard Armstrong)]

>
>I am looking for a way to remove conodonts from fairly well indurated, 
>organic-rich shales.  Not being a conodont worker by trade, I was 
>wondering what the standard procedure was for removal from these sorts 
>of rocks.
>
>Thanks!
>
>Adam Woods
>
>ADAM

DEPENDS HOW INDURATED
1)  DRY OVERNIGHT-SOAK FOR 2HRS IN PETROLEUM ETHER.  POUR ON BOILING WATER 
AND STAND BACK WITH FINGERS CROSSED. SIEVE AT 1MM AND 63MICRONS.  HEAVY 
LIQUID SEPARATE DRY SIEVED RESIDUE.

2)  IF LOW GREENSCHIST FACIES CRUSH TO 1-5MM PIECES AND SIEVE AT 63MICRONS 
AND HEAVY LIQUID SER AS ABOVE.

3)  YOU MIGHT TRY 10% HF FOR 8HRS IF THE ROCK IS CHERTY.  THEN AS ABOVE.

4) IF ALL ELSE FAILS YOU WILL JUST HAVE TO SCAN BEDDING PLANES.

HOWARD
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