Hoplitoides ammonite described by KOENEN circa 1897, has an evolute, discus shaped shell type, with strong narrow or thinning keel form, with a small umbilicus (central inner whorls). The outer shell has been removed and the whole has undergone precise and exacting preparation with an acid conservation enabling a fine polished surface. This process has revealed the delightful colouration within the limestone shell. Each chamber is picked out by the chalcedony, a type of quartz mineral that has been absorbed into the body cavities via per-mineralisation, when silts or mud's filled the empty shell eons ago, of the now extinct marine mollusc. This is the action and cause of the fossilisation process developing over millions of years.
Natures larder created the specimen fossil and our team have extracted and polished and ultimately surmounted the ammonoid creating a fine statement of this very large sized fossil for type. The bronze mount is custom fitted to the individual fossil specimen and forms part of our unique range. The natural ammonoid displaying calcification within the chambers which can been seen now the shell has been removed, is a delightful and unique event. Sediments of time have also created muted colourisation, caused by the absorption of minerals in the fossil limestone bed, this a type of metamorphism, the limestone was once a silty sea bed around 380 million years ago, the habitat of the cephalopods, a type of marine mollusc similar in attributes to the modern day nautilus.
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.
Fossil shells of the ammonoids have fascinated scholars for many centuries. Part of the Ammonoidea subclass, the class of Cephalopoda, related to our extant octopi. This is fossil remains of the internal shell of the marine animal, which created the outer shell or exoskeleton from chitin, a substance of a long-chain polymer of an N-acetylglucosamine (glucosamine and acetic acid), a derivative of glucose, an important building block mineral for the exoskeletons of many cephalopods, cephalopods are from the mollusca family, nautili, lobsters, crabs and shrimps.