FIGURE 1 in Systematic revision of the trilobite genera Laudonia and Lochmanolenellus (Olenelloidea) from the lower Dyeran (Cambrian Series 2) of western Laurentia

FIGURE 1. Provisional litho- and biostratigraphic correlation chart for the lower Cambrian at four sites along the Laurentian Cordilleran margin. Locations of sites shown in Fig. 2. Gray band indicates stratigraphic range of Laudonia and Lochmanolenellus within lower portion of Dyeran Stage, as discussed herein. Vertical scale is arbitrary and non-linear; relative thicknesses of litho- and biostratigraphic units are distorted. Laurentian series and stage names follow Palmer (1998a); old Waucoban trilobite zones (now abandoned) follow Fritz (1972); new trilobite zones follow Hollingsworth (2011) and Webster (2011). Correlations based on references cited in text plus unpublished observations; question marks indicate tentative lithostratigraphic correlations. Abbreviations: Del., Delamaran; Fm., Formation; Li., Lincolnian; Mb., Member; Mt., Mountain; Qzt., Quartzite.