SUMMARY OF GEOLOGICAL HISTORY
TABLE 1
![Table 1](/images/written_works/snowy_mountain_walks/table-1.jpg)
*Years ago to the beginning of the period. The Ordovician period, for example, lasted for about 80 million years, to the beginning of the Silurian period.
*Years ago to the beginning of the period. The Ordovician period, for example, lasted for about 80 million years, to the beginning of the Silurian period.