Cambrian, c. 500 million BC, trilobite, elrathia kingii,from Death Canyon, Antelope Springs, House range, Millard Co, Utah, dark reddish on light tan shale: 20mm, trilobite.  That's a repair in the matrix.  $15.00 sold
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Cambrian, c. 500 million BC, trilobite, perinopsis interstricta, 5mm in matrix, from Death Canyon, Utah, $8.00 sold
 
 
 
 
 
 
 
 
 
 
 
 
 

ORDOVICIAN, c. 430 million BC, trilobite, paraboling argentinae, 27x7mm & 2 smaller ones on 55x75mm triangular slate slab, from Jujuy, Argentina, $25.00 sold
Click picture for enlargement.
 
 
 
 
 
 
 
 
 

Lower Devonian, c. 380-360 million BC, trilobites from An-Nif, Morocco:

 a) thysanopeltidae family, 50mm long,  The fossil is folded at 90 degrees, all details beautifully present, $18.50 sold

 b) crotalocephalus ("snake head"), 60mm long, about 1/5 of the tail is missing, very minor chipping of some surface detail, $9.75 sold