Parkinsonia rarecostata Buckman 1889.
This specimen was on display for many years. Matrix free and to the centre both sides. Shows the patina typical of old specimens that have been handled a lot over time. An absolute 'gem'. They do not come any better than this
Jurassic, Bajocian, Garantiana Zone.
Freshwater near Burton Bradtock, Dorset.
Ammonite : 12.8 cm diam.
