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Hollardops Mesocristata And Gerastos Trilobite


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Hollardops Mesocristata is found in the fossil strata of the Emsian stage of the Devonian period, the Emsian is between 408 to 393 mya, the Gerastos genus trilobites in the Eifelian stage between 393 to 388 mya. So it may be safe to date these trilobites at the mid border of each stage around 388 million years for want of a more precise date. An excellent occurrence of the two genus types, each displaying characteristic attributes known to both genera. South of Foum Zguid is a dry arid desert of low lying mountains slowly sinking into the south eastern desert of Morocco, this area is also the greater western Sahara. 60km to the south is the border of Morocco and Algeria. To the east a vast Hamada of Algeria rises up to dominate the skyline. An exotic and enigmatic creature as the trilobite fits well into this complex pseudo lunar landscape, as this blackened rock strewn depression, the draa basin has that similarity to the Moon's lifeless surface. So it seems fitting these prehistoric alien invertebrates are re-visiting us from a very celestial looking landscape.

Genus: Hollardops Mesocristata and Gerastos.
Age: Palaeozoic era, Middle Devonian, Emsian to Eifelian stages approximately 408 to 388 million years.
Origin: Timrarhart Formation, Jbel Anhsour, Oued Draa basin, Foum Zguid, Morocco, North Africa.

Hollardops Mesocristata measurement.
Length: 6 cm
Width: 3.8 cm
height: 2 cm

Gerastos measurement.
Height: 0.5 cm
Length: 2.2 cm
Width: 1.6 cm

Overall measurement.
Height: 3 cm
Length: 11 cm
Width: 9.5 cm

Approximate weight: 364 g

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Hollardops Mesocristata And Gerastos Trilobite. Excellent double specimen plate, the Hollardops Mesocristata trilobite dating back to the Palaeozoic era, middle Devonian, approximately 388 million years. Originating in Morocco, North Africa.

The Gerastos species is known for its tubeculate cephalon or small tubercles on their front face, adopting reasonably large eyes for their size. Pepared to expose their exoskeleton, seated on their original bed rock of limestone commonly know as 'matrix'. The Gerastos is a member of the Proetida, this is the family of Proetidae which were among the last of the arthropods to become extinct in the Permian era, approximately 130 million years later.

Using the latest technology, pneumatic tools in conjunction of an air abrasive micro sand-blaster this double specimen plate has been prepared in a fossil preparation laboratory.

A brief trilobite history. The order or group of trilobites evolved during the Pre-Cambrian period approximately 550 million years ago, One of the most complex forms of early life, the trilobites reign lasted over 270 million years coming to an end around 250 million years ago in the time of the Permian period. Trilobite genus-types were diverse and globally extensive. The Trilobite was a member of the Proetida Order, Family of the Proetidae. Trilobites were complex animals, having the first compound eyes and segmented bodies which enabled them to enrolled, possibly for a defence posture.

Additional Information

Age No
Origin Morocco
Colour Black