Abstracts
Abstract
Two specimens, and a possible third, of the ichnotaxon Paleodictyon are documented from shallow-water marine strata of the Upper Ordovician Georgian Bay Formation of southern Ontario. Its occurrence indicates that previous suggestions of a post-Early Cambrian palaeoenvironmental retreat of Paleodictyon into deeper water require some modification. Instead, the operative migratory process, at least to the Late Ordovician and possibly even longer, was one of expansion and not of retreat.
RESUME
Deux specimens, et possiblement un troisieme, de la trace fossile Paliodictyon sont reconnus dans des strates marines peu profondes de la Formation de Georgian Bay de l'Ordovicien suplrieur du sud de 1'Ontario. Sa presence indique que les suggestions prec£dentes d'une retraite pallo-environnementale post-Cambrien precoce Ac Paliodictyon en eaux plus profondes n6cessitent quelques modifications. A la place, le processus migratoire operatif, au moins jusqu'a l'Ordovicien tardif et possiblement encore plus longtemps, en Itait un d'expansion et non de retraite.
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