I need to find case studies where fossils / microfossils have been
used in engineering projects. For example, in the bulding of the
channel tunnel, the tunnel bouring machines were kept on course by
analysing the microfossils in the rock they were drilling through -
this allowed them to ensure they were on course through the correct
rock strata.

I have some starting points but they all need fleshing out! 

1) Apparently an investigation for the River Severn Dam project, found
graptolites and these were used to date sandstone belts.

2) Tsunami deposits in Hawaii were identified using Microfossils.

3) The Chalk under the Thames Barrage was identified by the
mircofossils in contained.

If you could help me flesh out any of the above case studies or
provide any new ones, that would be great.

Kind regards,

Paul