We have no rock record in Illinois for the long interval of weathering and erosion that lasted from the time the Precambrian rocks were formed until the first Cambrian-age sediments accumulated, but the interval is almost as long as the time from the beginning of the Cambrian Period to the present.
(We; have; no rock record in Illinois for the long interval of weathering and erosion) (the long interval of weathering and erosion; lasted; from the time) (the Precambrian rocks; were formed; T:the time) (the first Cambrian-age sediments; accumulated; ) (the interval; is; almost as long as the time from the beginning of the Cambrian Period to the present)
We the long interval of weathering and erosion the Precambrian rocks the first Cambrian-age sediments the interval
have lasted were formed accumulated is
no rock record in Illinois for the long interval of weathering and erosion
from the time
T:the time
almost as long as the time from the beginning of the Cambrian Period to the present