... geographic extension (Agdz-Zagora area, central Anti-Atlas, Morocco). Since the original description of its type species ( R. destombesi Ubaghs, 1963), three successive revisions of the genus Rhopalocystis have led to the erection of nine additional species. The morphological disparity within this genus...

...Fig. 1.— Geologic context of the studied material. A ) Synthetic stratigraphic column of the Lower Ordovician succession in the Zagora area, Morocco showing the position of the two intervals yielding exceptionally preserved faunas (KsL); modified from Gutiérrez-Marco and Martin (2016...

...., 1967 ; Zagora, K., 1967 ; Zagora, 1968 ). Laurentia – Emsian–Eifelian (Adamczak, 1968 ; Kesling & Chilman, 1978 ). Abbreviations: Go. – Gondwana, Mor. – Morocco. ...

... the Fezouata Shale Formation at Tanssikhte, Zagora, in the Anti-Atlas of Morocco. The specimen ( Figs. 1 , 2 ) is preserved as part and counterpart, consisting of the nearly complete cephalon, all or parts of all eight thoracic segments, and the right half of the pygidium. The antennae are the only exposed...

... in this euarthropod group. The Fezouata Shale is a sequence of Lower Ordovician strata geographically belonging to the Anti-Atlas region of Morocco. North of Zagora, the Lower Ordovician strata are exposed in the Ternata plain, forming the Tremadocian – early Darriwilian Outer Feijas Shale Group (Choubert et...

..., nutrient availability or even physical disturbances caused by storm events (Saleh et al. 2018 ). During the Ordovician Period, Morocco was part of the Gondwana margins, at high latitudes, close to the South Pole. The Fezouata Shale was deposited in the Zagora region in Morocco, under cold waters...

... far to discovering within which sediment minerals the pyritized soft tissues occur and what the processes behind the deposition of these minerals are. The Fezouata Shale crops out in the Zagora region in southern Morocco. This Lower Ordovician succession consists of blue-green to yellow-green...

...Fig. 1. Ordovician outcrop map of the area north of Zagora, southeastern Morocco. Areas that yield exceptionally preserved fossils are indicated in colour: red areas with yellow trim belong to the Araneograptus murrayi biozone; yellow areas with red trim fall in the Hunnegraptus copiosus zone...

... as Oumjrane, NE of Zagora, SE Morocco (30.639525°N, 005.104275°W)—Darriwilian; purchased by James Sprinkle from Moussa Minerals & Fossils at Tucson Fossil Show (February 14, 2014); specimen #4, NPL 74385, top and bottom folded counterpart molds in concretion ( Fig. 3 .5, 3 .6), same trilobite trench...

...Figure 1. Ordovician outcrop map of the area north of Zagora, southeastern Morocco. Crosshairs indicate the position of the Bou Chrebeb locality where Brachyaglaspis singularis gen. et sp. nov. was found. Insets show the position of the map below...

.... In the area to the north of Zagora, the lower and upper Fezouata Formations of the eastern Anti-Atlas of Morocco comprise a thick (>1000 m) succession of mudstone deposited in a deep-water setting ( Fig. 1 ; Van Roy et al., 2010 ). The formations were deposited during the Early Ordovician (late...

... and the acoustic impedance. Our study investigates a variety of iron meteorites collected in Morocco and other countries and it helps to understand how the nickel content of these meteorites affects the acoustic impedance. It reveals that the acoustic impedance of iron meteorites increases with increasing nickel...