This video is about an Eurypterid fossil.
From World Science:
Scorpion bigger than human described
Nov. 30, 2005
Courtesy Nature and World Science staff
A geologist working in Scotland has uncovered footprints that he says come from a fearsome water scorpion bigger than a human.
The tracks were made about 330 million years ago by a six-legged creature called Hibbertopterus, according to Martin Whyte of the University of Sheffield, U.K.
Hibbertopterus was some 1.6 metres (5¼ feet) long and a metre (3¼ feet) wide, he added.
The tracks show that this now-extinct group of animals, previously thought to dwell in water only, could also survive on land, according to Whyte.
The six-metre-long trackway reveals strides that were 27 cm (11 inches) long, and also features a central groove left by the creature’s dragging tail, according to Whyte.
This, he added, shows the creature was probably a very slow, lumbering beast when moving on land.
Whyte described the finding in the Dec. 1 issue of the research journal Nature.