This free standing Arnioceras block ha

the Ammonite measures 3.5 cm

other smaller ammonites measure 2 cm < .5 cm 

the matrix measures 15.5 cm x 9.5 cm x 4 cm

this ammonite was found in Lyme Regis and is approx 190 myo

from the lower lias and is of the Jurassic period 

weight 1044 g