From Ddaily Mail UK:
So the ink solidified but hadn't turned to stone after 155 million years?
155million years old and still inky: The perfectly preserved squid fossil amazing scientists
The squid-like creature perished some 155million years ago.
But despite the vast passage of time, experts who unearthed the fossilised remains were able to extract ink from its perfectly-preserved sac and use it to paint a picture of the ancient animal.
The odds of finding something as delicate as a squid’s ink sac intact after so long are put at a billion to one.
An eye on history: A palaeontologist views the fossil found in inland Wiltshire
The key is the speed with which it was fossilised in rocks in Wiltshire that were under the sea during the Jurassic period.
Scientists describe it as the Medusa effect, after the monster in Greek mythology whose face was so terrible to behold that anyone gazing at her was turned to stone.
Dr Phil Wilby, who led the team which found the fossil, said: ‘The decomposition process usually means only the hard parts of an animal are preserved.
‘It is extremely rare to find any fossil with the soft parts preserved. We call it the Medusa effect - specimens turn to stone within a matter of days, before the soft parts can be eaten away.’
Pen and (very, very old) ink: The squid's pigment is used to draw a description of it
The inch-long ink sac had become separated from its owner - Belemnotheutis antiquus - which Dr Wilby said was ‘squid-like but not the same as a modern-day squid’.
However the black ink was of exactly the same structure as that of today’s version. Although solidified, some was ground up with an ammonia solution to make paint.
The ink sac was among several thousand fossils removed from the site by Dr Wilby, of the British Geological Survey.
He hopes that analysing them will reveal why so many creatures perished in the area and how some have been so well-preserved they look as if they have only just died.
The site was known about in the Victorian era and was one of the first in the world to yield fossils of fragile muscle and stomach tissue.
But its exact location became lost until rediscovered recently by Dr Wilby.
BBC News also has the story:
H/T Creation-Evolution Headlines