'Calx carbonata' [Ammonite with crystals] mb-height 2029 Highgate in the distance

Highgate in the distance

The Royal Naval School at New Cross

Back row left to right: Sandy Brown

Plate 3 from The natural history of monkeys

at Athy in Ireland

'Calx carbonata' [Ammonite with crystals] mb-height 2029 Highgate in the distanceFossil ammonite section with two details of calcium carbonate crystals, here termed 'crystallized carbonate of lime, lenticular equiaxed'. Plate 12 from British mineralogy: or coloured figures intended to elucidate the mineralogy of Great Britain, by James Sowerby, volume 1 (London, R. Taylor & Co., 1804). The accompanying text states that the fossil 'is the Helmintholithus Ammonites of Linn. Gmel. abundant in many parts of Great Britain.' The