Natural Goniatite ammonoids which have been treated with an acid preparation giving the Goniatite ammonoid a more organic appearance. The chambers clearly distinguished by calcification, Calcite minerals have grown within the shell, this occurs during the fossilisation process’s. The Goniatitic chamber alignment is also a very interesting feature of these specimens. Each Goniatites having warm brown tonal colours to white calcite inclusions of the quartz mineral family. The goniatites present a pleasing natural sculptural form as well as a scientifically interesting fossil ammonoid specimen.
The natural Goniatites displaying calcification within the chambers which can been seen now the shell has been removed. Overall each of the Goniatites is a delightful and unique fossil specimen. Sediments of time have created muted colorisation, caused by the absorption of minerals in the fossil bed limestone, this a type of fossil metamorphism, the limestone was once a silty sea bed around 380 million years ago.
Goniatites are ammonoids, ammonoids are an extinct type of cephalopod. The cephalopod group include modern day octopi, squids and cuttlefish. Cephalopod named from the Greek and so aptly named, loosely translated to English as head-foot. The ammonoids range lasted from the Cambrian period around 500 million years ago up to the Cretaceous period around 65 million years ago. An immense period of time which led to much dimorphism between different genera.