These fossil Gryphaea oysters are part of a collection of glacial erratics from Mid-Suffolk given to GeoSuffolk earlier this month. We are sorting them -some will go to a Museum and others will star on some of GeoSuffolk's outreach stands this year. These Gryphaea are 9-10 cm across and have been brought by the ice to Suffolk from Jurassic clays which stretch from the Fenland to Yorkshire.