Assertion: horseshoe crab | /r/AtLocation | existence
Facets:
value: for over 300 million years
type: TEMPORAL
Source sentences:
text: They’ve been in existence for nearly half a billion years, predating the dinosaurs and earning them the title of “living fossils.
text: They have been in existence for over 300 million years and are similar in many respects to the extinct trilobites, alongside which they evolved in shallow seas of the Paleozoic era; for this reason they are often referred to as being "living fossils.