Crocodylomorph eggshell sections under petrographic and scanning electron microscopes.

<p><b>A.</b> Crocodylomorph eggshell (VPL/CCE 3) section under crossed nicols showing floating quartz grain in calcareous matrix and horizontal accretion lines and the typical crocodilian inverted triangle extinction pattern. <b>B.</b> One portion of the eggshell (VPL/CCE 4) cut tangentially to show overlapping trapezoid shell units and irregular blocky extinction. <b>C.</b> Scanning Electron Micrograph of polished and etched eggshell section showing basal knob (BK) and smooth but uneven outer surface. <b>D.</b> The outer part of the same section enlarged showing herringbone pattern. <b>E.</b> inner layer showing wedges diverging outwards from the basal knobs (BK) and the pore canal (PC).