Dipleura dekayi scale in cms CLASS - Trilobite ORDER - Phacopida FAMILY - Homalonotidae GENUS/SPECIES - Dipleura dekayi ROCK UNIT - Skaneateles Formation, Hamilton Group AGE - Middle Devonian (380 million years old) LOCALITY - North Brook field, New York, USA This large trilobite occurs in many different rock layers of the Hamilton Group in central New York, representing a span of several million years. It is only commonly found in silt stone (a mixture of mud and sand), very fine-grained sandstone, and sandy limestone beds that are riddled with burrows. It appears that Dipleura liked living in and on the sea-floor in areas where fine sands were being deposited. Maybe they ate the sea worms and other creatures that preferred burrowing through these sediments PRI 41463