On this piece there are three specimens of the rarely offered echinoderm Camptostroma roddyi from the Kinzer formation.
Camptostroma roddyi is an extinct echinoderm from the Bonnia-Olenellus zone of the lower Cambrian Kinzers Formation near York and Lancaster in southeastern Pennsylvania.  

Due to its unusual, cupcake-like shape, it was originally thought to be a jellyfish-like organism, but the fossils themselves clearly out rule  this possibility. The armor plates are clearly preserved and have the characteristics typical of echinoderms.  Camptostroma was placed in a class of basal echinoderms, the edrioasteroids. There is conclusive speculation that the earliest known representatives of this group have already been found from the Ediacarian. After all, the Precambrian fossil Arkarua has many similarities to the group of Edrioasteroids.
The largest Camptostroma specimen on this piece measures about 38 mm.

 

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