The fossil I found was 100' from the Mananoosnok river that leads to the Nashaua river In Leominster Mass., A geolagist from Amherst college told me it wasformed between the Silurian anf Devonion peried 400,000,000 years ago, Its imprints all over it are Brankiopods. Th2is fossil was formed byTectonic plates colliding, 400 million yrs ago the Mannosnok river was a shallow sea.

5'' BY 4'' BY 3'' THICK