These are round, ridged ammonites with frills at where the head would have been. These are from the Cretaceous period and are covered in chalk
No interactions present.
Probably useful to have them photographed against a uniform background (perhaps a grey card or similar) with a scale to show their size, and have a few different shots to show both sides and a close up of any important detail. possibly also of the original geological formation where you found them. you can put all these shots on the one observation.
Lat/Lng: 51.2, 0.5
OS grid ref: TQ7753