CRANEFLIES : Family : Tipulidae.
Small piece of olive green shale. On one surface there are the remains of at least 10 Craneflies. . Some still have the wings attached. Nice preservation. Fine detail under magnification.
Eocene, Green River Formation, Parachute Creek Member.
'Raydome' locality, Douglas Pass, Garfield County, Colorado, USA.
Specimen : 8 x 5.5 cm.