Holzmaden Nautiloid plate, beautifully curated for interiors around the world. An exquisite Holzmaden Nautili plate exhibiting exquisite preservation and conservation of the fossil Ammonoids, the cephalopod Nautiloids part of the Ammonoidea family have absorbed through a processive of per-mineralisation the surround mineral deposits of iron during the fossilisation process which has taken over 150,000,000 years. The mineral iron is in the form of Iron pyrite, more commonly known as fools gold. Fools gold is often found in occurrence of gold ore and is used as an indication of a possible gold seam.
The surrounding shale has been carefully and precisely fashioned from the shale fossil layer, prepared and finally conserved, finished with Italian waxes, providing a fine naturalistic aesthetically pleasing statement plate. This fossil inclusion and plate are 100% natural fossil from the fossilisation of Nautiloids and of the iron pyrite inclusions. Each nautiloid demonstrates great detail of the phragmacone exoskeleton (shell), all three specimens feature fine ribbed large sized phragmacones.
The Nautiloids are an enigmatic group of cephalopods, extant (living), genus types, the Nautilus pompilius and Nautilus umbilicalis survive today in the S.W.Pacific ocean. With ancestral lineage in the late Permian to Ordovician periods, since evolving Nautiloids have suffered extinctions in the Devonian, Carboniferous and Cretaceous. In fact the Nautiloids seem in a state of contraction for much of this varied history. Seemingly in decline as the Ammonites were increasing successfully and in variety, a direct reflection of the ecology of the prehistoric marine environment in relation to both cephalopod branches.
The Ammonites eventually becoming extinct in the Maastrichtian age, just before the mass KT extinction event. It is thought that the Nautiloids survived probably due to their benthic ecology. Laying small batch eggs often, at depth or on the sea floor with more frequency, throughout their life, thus protecting the eggs from most major climatic changes. Where as the Ammonites laid one batch of numerous eggs at the end of life and attached these to marine planktonic environments, close to the surface which made them more susceptible to any major planetary climatic change.
Nautilus are nektobenthic carnivores and pelagic in habit. The umbilicus of this shell of the genus is involute and globose. Cenoceras described by Hyatt C.1884,, Pseudocenoceras by Sparth C.1927.