We found a lot of those in a town called Baruth in Brandenburg, where they
were called "Knüppeldamm" (singular). I don't remember the dating or wood
type; my job was just documenting where they were and taking samples.
There is a photo of one from another excavation in Oranienberg here:
http://de.wikipedia.org/wiki/Kn%C3%BCppeldamm
and the article on prehistoric examples looks interesting:
http://de.wikipedia.org/wiki/Vorgeschichtlicher_Bohlenweg


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I am working on a paper for a regional peer-reviewed journal on corduroy
road archaeology and I am currently in the process of collecting as many
contexts as I can (up to 24 at last count). The paper is based partly on a
corduroy road site Hartgen found in New York's North Country dating to the
late 18th c. I am particularly interested in construction techs, dating
techniques, method of discovery, and species.