glaciation during the last 2 million years has left a thin cover of glacial sediments over the surface of most of the state, and this cover has resulted in constructional topography in many places (topography created by build-up of deposits of sediment) Precambrian mountain building rocks of the Canadian Shield in northern Minnesota, especially the Lake Superior region, contain the record of earth history, from 3,600 million years ago to about 600 million years ago - 3 billion years of geological record!
(this cover; has resulted; in constructional topography in many places) (topography; created; by build-up of deposits of sediment) (Precambrian mountain building rocks of the Canadian Shield in northern Minnesota; contain; the record of earth history, from 3,600 million years ago to about 600 million years ago - 3 billion years of geological record) Context(Precambrian mountain building rocks of the Canadian Shield in northern Minnesota contain,List([254, 380))):(glaciation during the last 2 million years; has left; a thin cover of glacial sediments; T:over the surface of most of the state)
Precambrian mountain building rocks of the Canadian Shield in northern Minnesota contain,List([254, 380))
this cover topography Precambrian mountain building rocks of the Canadian Shield in northern Minnesota glaciation during the last 2 million years
has resulted created contain has left
in constructional topography in many places
by build-up of deposits of sediment
the record of earth history, from 3,600 million years ago to about 600 million years ago - 3 billion years of geological record
a thin cover of glacial sediments T:over the surface of most of the state