Fig. 2.

Root arrangement and variable preservation of root-bearing axes and attached roots in the Cottonwood Canyon lycophyte. Root tufts range from intact (A, B) to completely absent due to poor preservation or to the fact that they are covered by the rock matrix (F). The tips of some otherwise well-preserved roots are not seen because they depart into the rock matrix (C, D). In other specimens only the bases of root tufts are preserved (E), or roots are not preserved at all and their position is indicated only by root traces in the cortex of subtending axes (F; arrow); note similar root vascular traces in the cortex of other root-bearing axes (C, D; arrows). Preservation of the root-bearing axes ranges from coalified (B, D) to fully oxidized (A). (C), (E) and (F) show partial oxidation of the stele. Note alternate and opposite root arrangement on the same axis in (C) and (E). Scale bars = 5 mm. Specimens: KU D1813 (A), KU D1618b (B), KU D1804 (C), KU D876b (D), KU D1281b (E), KU D1166a (F).