The Trilobite Observer is an account of my observations on Devonian trilobites from the Ardennes (Belgium, Luxembourg, N-France), Eifel (Germany) and southern Morocco. The Devonian rocks that outcrop here were deposited some 400 million years ago in the so-called Rheic Ocean. I invite you to join me on a journey through time, to the Devonian period, the era of some of the most bizarre looking trilobites.

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Photo: "Roche à l'Appel" - During the Devonian period the Ardennes were part of an arid plateau south of an incompletely eroded mountain range which had formed during the Caledonian orogeny. At around the Silurian-Devonian boundary, a major marine transgression began to flood the southern part of the region. Conglomerates (rounded rocks which are cemented together, typically formed very near-shore) were laid down unconformably on the denuded Lower Palaeozoic basement which evidences the initial submersion of the land. The remains of some of these conglomerates can still be observed today, such as the “Poudingue de Fépin” which is exposed at the famous “Roche à l’Appel” near Muno, S-Belgium.