Figure 16.6 The use of conodont assemblages in stratigraphy: alternation of primo and secundo oceanic states correlated with part of the Lower Silurian succession of the Oslo region, Norway. In the stratigraphic column, limestone is shown by a blocky pattern and mudstone by gray. (Courtesy of Dick Aldridge.)

anterior comb-like ramiform elements probably grasped prey items that were sucked towards the mouth, and the posterior pectini-form elements may have chomped the food before swallowing. One the greatest mysteries in paleontology had been solved.

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