At the centre of Gristhorpe Bay, blocks of Oxford clay yield Ammonites of Parawedekindia arduennensis and Cardioceras praecordatum. Within a pale grey limestone of the Hackness Rock Member, Kosmoceras spinosum and Quenstedtoceras can be found.

The Cornbash Limestone can contain many gastropods, bivalves and other fossils. It is quite a walk north before you reach the Gristhorpe Plant Beds. These beds are on the Northern side of Yons Nab, 1m below a silty shale bed. Within this bed, well preserved stems, leaves of Bennetitales, Ferns, Pteridophytes, Ginkgoales, Cornifers and other plants. This bed is certainly the most interesting and most collected from the Gristhorpe area.

The following list of fossil plants can be found, which also shows how common they are;

Hepaticites arcuatus – Rare
Todites princeps – Common
Todites thomasii – Rare
Todites williamsonii – Abundant
Todites denticulatus – Rare
Cladophlebis denticulate – Abundant
Osmundopsis sturii – Rare
Phlebopteris polypodioides – Common
Phlebopteris woodwardii – Rare
Matonia braunii – Rare
Dictyophyllum rugosum – Common
Klukia exilis – Common
Coniopteris bella – Rare
Coniopteris hymenophylloides – Abundant
Coniopteris murrayana – Rare
Eboracia lobifolia – Common
Dicksonia mariopteris – Rare
Aspidistes thomasii – Rare
Sagenopteris phillipsii – Common
Sagenopteris colpodes small form – Common
Caytonia Sewardii – Common
Caytonia nathorstii – Common
Caytonanthus arberi – Rare
Caytonanthus oncodes – Rare
Stenopteris williamsonis – Rare
Ctenozamites leckenbyi – Rare
Nilsonia compta – Abundant
Nilsonia tenuinervis – Rare
Nilsonia tenuicaulis – Common
Pseudoctenis lanei – Rare
Ctenis sulcicaulis – Common
Nilssoniopteris vittata – Abundant
Nilssoniopteris major – Rare
Anomozamites nilsonii – Common
Pterophyllum thomasii – Rare
Otozamites beanie – Rare
Otozamites graphicus – Rare
Ptilophyllum pectin – Abundant
Weltrichia pectin – Rare
Ginkgo digitata – Common
Ginkgo longifolius – Rare
Eretmophyllum pubescens – Common
Czekanowskia microphylla – Rare
Czekanowskia thomasii – Common
Solenites vimineus – Common
Brachyphyllum mamillare – Common
Araucarites phillipsii (female) – Rare
Elatides williamsonii – Abundant
Elatocladus laxus – Common
Elatocladus zamioides – Rare
Pagiophyllum insigne – Rare
Bilsdalea dura – Common