Deep Sea Drilling Project
The Deep Sea Drilling Project (DSDP) was an American project to study plate tectonics and paleoceanography . The DSDP ran from 1968 to 1983. From 1985 the Ocean Drilling Program (ODP) followed with improved technology.
method
The research vessel Glomar Challenger used offered the opportunity to drill holes on the seabed of the deep sea and thus to obtain rock samples. For this purpose, for example, at a water depth of a few thousand meters, a thousand meters deep hole was drilled in the sea floor.
background
The rock samples or deposits from the sea floor contain indirect information on historical climate fluctuations and environmental conditions. So stay z. B. Shell fragments of microalgae obtained in the sediments and can be evaluated over millennia.