Type
Zone
Age range
515.5–511.1 Ma
Series 2
Stage 4
Stage 3
Eokochaspis nodosa
Olenellus
Nevadella
515.6515.4515.2515.0514.8514.6514.4514.2514.0513.8513.6513.4513.2513.0512.8512.6512.4512.2512.0511.8511.6511.4511.2511.0