Her observations played a key role in the discoveries that belemnite fossils contained fossilized ink sacs, and that coprolites, known as bezoar stones at the time, were fossilized faeces. When the geologist Henry De la Beche painted "Duria Antiquior", he based it largely on fossils Anning had found. He sold prints for her benefit. Her work played a key role in the growth of scientific biology in the early 19th century. It showed without question that previously unknown forms of life had existed in the Jurassic seas, all of which were long extinct.