This is a nice plate of uncommon Ordovician trilobites. These are Norinia convexa (large) and Paraszechuanella (smaller) from the Hunan Province of China. The trilobites have good detail and contrast well on the plate of grey limestone. The bugs are nicely showcased on the large block of matrix that has natural, white fault lines running through it (not breaks or cracks). These are fine Ordovician trilobites from China that are getting increasingly hard to obtain.