Figure 3: Generalised stratigraphy of the early - middle Cambrian transition in the Lemdad Syncline area, High Atlas Mountains, Morocco. | Scientific Reports

Figure 3: Generalised stratigraphy of the early - middle Cambrian transition in the Lemdad Syncline area, High Atlas Mountains, Morocco.

From: A xandarellid artiopodan from Morocco – a middle Cambrian link between soft-bodied euarthropod communities in North Africa and South China

Figure 3

Strata in the Lemdad Syncline correlated to the international geological timescale using the Moroccan regional biostratigraphic framework and shown alongside the relative ages of other Cambrian Lagerstätte with Burgess Shale-type faunas. Compiled from Geyer and Landing15, Geyer and Vincent18, Geyer and Malinky19, and Van Roy et al.54. [a]Radiometric age for the upper Antatlasia guttapluviae Zone in the Lemdad Syncline recalculated21 after 517 ± 1.5 Ma22; note the discrepancy between this age and the international age (ca. 510 Ma) of Cambrian Series 2 Stage 4 to which the A. guttapluviae Zone has been biostratigraphically correlated15,17,19. Correlation of early and middle Cambrian strata in Morocco with the international timescale would greatly benefit from additional radiometric constraints.

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