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Asaphellus Ordovician Trilobite 138mm SOLD

SKU:TFS0975
£122.00

Availability:Out of stock

Details:

Asaphellus cf. jujuanus Harrington trilobite quite naturally split shale fossil revealing the full carapace sprawled over the limestone matrix, once long ago the sea floor. A fine specimen exhibiting excellent rust colour typical of the heavy iron concentrations of the region.

Genus: Asaphellus cf. jujuanus Harrington, described 1937.
Age: Ordovician period, Tremadocian stage, 485 to 478 million years ago.
Origin: Fezouta shale formations, Valley Du Draa, Zagora, Morocco.

Asaphellus cf. jujuanus measurements.
Length: 4.4 cm
Width: 3.0 cm
Height: 0.3 cm (off plate)

Overall weight: 0,522 g

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Details

The genus of this trilobite was described in the last century by H. J. Harrington. Having also described the genus type in Argentina thus placing evidence forward once again of the break-up and joining of continents throughout the Palaeozoic and Mesozoic periods. The carapace is positioned well on the original bedding plane, the shale of the fossil layer, which is from Fezouta shale north of Zagora. A small town in the Draa River valley, The Drâa-Tafilalet region of southeastern Morocco. From Zagora, signs proclaim it is 52 days to Timbouctou.


The Asaphellus trilobite is in excellent condition displaying the attributes of the type. The cephalon and pygidium evenly sized, the cephalon only slightly larger. The segments of the thorax are clearly defined, and the eyes raise quite prominently. Other Ordovician trilobites also feature to one corner of the plate. No repairs to this specimen, it is quite naturally exhibiting in the split shale plate.


The process of excavating these types in the Fezouta shales is one of simply splitting the shale. A strong blow to the limestone can reveal if very fortunate a complete specimen like this. The process often takes place after the hard work of climbing over the mountain range skirting the Sahara western desert, in search of outcrops of fossil-bearing rock. When the rock has been excavated the work begins splitting, this can be attempted many times before a good specimen is produced.