11. Tunnel valleys frequently include relatively straight individual segments parallel to and independent of one another.12. Tunnel valleys fill in two main ways.13. Vejle River Valley and Vejle Fjord together form the longest tunnel valley in eastern Jutland. 14. Tunnel valleys play a useful role in identifying oil rich areas in Arabia and North Africa.15. Hence the presence of tunnel valleys is an indicator of the presence of oil in these areas. 16. Tunnel valleys are likely to fill with sediment as the result of meltwater release during glacial recession.17. In the first instance, debris carried by flow settles out and accumulates in the tunnel valley . 18. The tunnel valley sedimentary record is controlled by meltwater release flowrates and sediment burdens during glacial recession. 19. Tunnel valleys are often buried or partially buried by sediment accumulation during periods of ice advance and retreat.20. Tunnel valleys may remain open, partially filled or filled, as a function of the glacial recession.
