R261 - Nicely Prepared 3.54 Inch Crotalocephalina gibbus Devonian Trilobite - Sebastian Order Nevadia weeksi 3 mm μm in size

3 mm μm in size whereas pyroxene varies from 200 to 400 μm

Gamonedaspis

See also Fortey 1975

which has as a result that some small pieces are lost forever

McCollum 2000

R261 - Nicely Prepared 3.54 Inch Crotalocephalina gibbus Devonian Trilobite - Sebastian Order Nevadia weeksi 3 mm μm in sizeR261 Nicely Prepared 3. 54 Inch Crotalocephalina gibbus Devonian Trilobite(143911380036) SPECIES Crotalocephalus (Crotalocephalina) gibbus tifletenzis, Alberti (1969) AGE Lower Devonian, Pragian stage (~410 Million Years) LOCATION Alnif region, South Morocco FORMATION Hamar Lagdad Fm SIZE 90 mm 3. 54 in WEIGHT 332 g REF. R261 Observations: Nicely prepared specimen. Prepared as partial free standing. It has only minimal restorations.