The two plates one positive and one negative of the same fossilised arthropod, a trilobite from the Cambrian era, both plates are in a miraculous state of preservation. Mother nature has played the greatest part in this unique conservation of the large alien looking bug. As many collectors aptly use this term when referring to the segmented thoracic segment and globular cephalon (head), these plus the pygidium (tail), spines do make for remarkable imagery now that the prehistoric marine invertebrate seems to have frozen on the limestone, which was once the seabed.
The trilobite surmounted on a fine pair of custom bronze mounts, part of our classic range of specimens, set into bronze clasps, the specimen can be easily lifted off for study and shipping. The whole set onto the bronzed plinth bases making for a wonderful display. The specimen is absolutely unique, every fossil is unique of course, the quality of preservation is of an apex collection fossil trilobite specimen. The preservation is great, the trilobite plate is formed by carefully splitting the nodule, no preparation or restoration has been necessary apart from a single join on one plate, this is very minor work, it is quite a normal happenstance these split plates have much more reaffixing work carried out at excavation when most damage can take place and during post-excavation work on specimens, in this instance that is not the case. A wonderful and natural specimen in such condition elevates the trilobite to the top echelons in trilobite collecting from this location and time period.
The attractive colour is from the fossil bed. Heavy minerals cause the burnt umber colouration a byproduct of the heavy concentrations of iron in the region of the fossil bed and typical of this formation. This transpires as a dusty coating of fine limestone. Giving the fossil a most recognisable signature. The dark bronze colour of the mounts complements the fossils.
Paradoxides acadoparadoxides trilobite positive and negative plates discovered at Sidi Abdallah ben el Hadji fossil formation in Morocco. These date back to the Cambrian period which is approximately five hundred and forty to five hundred million years ago. The Paradoxides acadoparadoxides trilobite beds are located in the Atlas mountains, in the Jbel Wawrmast Formation, Zagora region of the Draa Valley, near Sidi Abdullah ben el Hadj village and Alnif, North Africa. The Paradoxides acadoparadoxides trilobites arranged by a natural event as the fast swimming invertebrates were trapped in the silts of time. Covered perhaps in some underwater cataclysm which petrified and fossilised these trilobites over millions of years.
The process of fossilisation is best achieved in an anoxic environment when sufficiently buried without oxygen bacteria cannot quickly establish on the once living organisms and so this enables the successful and very rare event of fossilisation. The beautiful palette colours caused by mineral absorption into the invertebrates carapaces (exoskeleton) and surrounding matrix (fossil bedrock), this created natural earth colours which are mainly due to iron oxides being present in the sediments. The sublime and natural placement of the extinct ocean dwelling arthropods is aesthetically pleasing with thoracic furrows and appendages creating dramatic shadowy forgotten worlds.
Trilobites are named from the Greek, the latin naming of 'tri' and 'lobos', the three lobes of the trilobites body. The carapace is made up of three main lobes which run longitudinally the length of the doublure (the carapace or exoskeleton), In this wonderful example above the three main lobes are well detailed and therefore easily discernible to the novice as much to the connoisseur collector. The central lobe is termed the axial lobe, each side of this are the right and left pleural lobes. These lobes run through the cephalon (head shield) and the pygidium, the tail section.
A very brief pre-Cambrian and Cambrian trilobite history. The class of trilobites evolved during the Pre-Cambrian period this time period began around five hundred and forty million years ago, the phylum arthropoda of that time were the most complex forms of animal life in the oceans, the trilobites reign in the oceans of the world lasted over two hundred and seventy million years finally coming to an end around two hundred and fifty million years ago during the Permian great death, a cataclysmic extinction event with saw the demise of almost 90% of life on the planet. Before this extinction level event trilobites were diverse and ranged globally. They were complex animals, having the first compound eyes and segmented bodies enabling them to escape danger by enrolling, and aiding fast movement and evolution of seabed dwellers as well as some free swimming varieties.
The Paradoxides acadoparadoxides trilobites were discovered in the Atlas mountains, in the Jbel Wawrmast Formation, of Zagora region, the Draa Valley, near Alnifi, Sidi Abdullah ben el Hadj village, Morocco, North Africa. Phylum Arthropoda, Class Trilobita, Order Redlichiida, Suborder Redlichiina, Family Paradoxididae, Genus Acadoparadoxides, Specie type A. sacheri (Barrande, 1852), described, Acadoparadoxides harlani Green (Walcott 1884), Acadoparadoxides Šnajdr, 1957, Acadoparadoxides mureroensis Sdzuy 1958 (2nd edition Richard Levi Setti), Acadoparadoxides briareus (Geyer, 1993).
Topical Note: This type of Moroccan trilobite plate is susceptible to forgery by unscrupulous Moroccan sellers, these copies are prolific in the fossil marketplace in Africa and the rest of the world. Because of the nature of the limestone, which is very forgiving, replicas cast from original fossil trilobites have been manufactured in the past. Also, pieces of partially surviving trilobites are stuck together to appear as one original repaired trilobite, covered with reddish iron powder, excavated from the originating fossil beds concealing any break lines when the reconstructed pizza style plates are built up. Often the Moroccan plates are etched with a hatching technique around the trilobite in an attempt to hide reconstruction lines. The method is also carried out on original plates which have been excavated in pieces and reconstructed or restored, which is a different matter and not faking the original and natural product. A competent reconstruction can be challenging to detect to the layperson. Every fossil from our website thefossilstore.com comes with a firm guarantee of authenticity which can be verified.