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Georgian Bay Islands National Park
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geosyncline
ge·o·syn·cline [ j ō síng kln ] (plural ge·o·syn·clines)


noun 
Definition:
 
depression in Earth's crust: a long broad depression in the Earth's crust where it has sunk over time as it has accumulated a thick layer of sedimentary deposits

ge·o·syn·cli·nal [ j ō sing kln'l ] adjective
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