The geological setting is generally a prerequisite for a good understanding of the ground conditions in the project area. Often a general geological map exists in scale between 1: 50,000 and 1:100,000. For large projects, a separate or additional geological mapping is often conducted. A wrongly geological base may cause wrong interpretations as e.g.as described in the paper by Winter et al, 1994 and hence strongly influence on the construction of the project.
You will find a geological timescale here and here (/files/geo_timescale.pdf) and in website
(note that Tertiary has been changed into Paleogene and Neogene)
More on geological times can be found on International Commission on Stratigraphy