This is an unusual trilobite double. It is a Dalmanites limulurus and Calymene niagarensis from New York. This plate is fully natural - they sit on the plate exactly where they died millions of years ago. Both trilobites are complete and have nice detail preserved. The bugs are well presented on the large plate of shale. This is a very displayable Dalmanites and Calymene preserved together forever.
This fossil was collected and obtained legally, and is also being sold legally.