James Hutton was the very first geologist to recognize the vast amount of missing time (at least all of Silurian)represented by the angular unconformity where the gently dipping Devonian "Old Red Sandstone" overlies vertical Ordovician slates at Siccar Point, Scotland.

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This statement is true. James Hutton was the first person to recognize the significance of the angular unconformity at Siccar Point and to understand that it represented a vast amount of time missing from the rock record.

James Hutton Was the Very First Geologist to Recognize the Vast