PARKINSONIA RARECOSTATA - JURASSIC, DORSET.

Parkinsonia rarecostata

​​​​​​​Beautifully preserved specimen. To centre one side. Sharp bifurcating ribbing. 

Jurassic, Bajocian. Parkinsoni Zone.
​​​​​​​Burton Bradstock, Dorset.

Ammonite : 8.4 cm diam.