Cenovus is trying out a miniature rig that can be helicoptered in piece by piece to minimize the carving of boggy forests with service roads.
But soon boggy forests were drained by industrious laborers and settlers, with railroads following, allowing these counties to account for much of their states' growth in the final antebellum decade.
Dartmoor's dramatic tors, boggy marshes and forested flatlands provided the famous backdrop to the Sherlock Holmes classic Hound of the Baskervilles and hit the big screen recently in the Spielberg epic War Horse - fans of both can take guided walks to the respective locations.
This then sweeps to the left to follow a drystone wall, and passes through forest and boggy ground to a gate.
Searches were taking place in Corcy and the nearby village of Longpont, set in thick forest and boggy marshland about 70 km north of Paris, but it was not clear whether the fugitives who had been spotted in the area were holed up or had moved on.
The invisible rail inhabits the dense, spiky sago swamps of Halmahera, particularly where forest adjoins the boggy areas.
This will be, he says, the last time they stop at this particular spot, as years of weekly visits mean boggy trails now lightly scar the forest floor.
The Forest of Bowland, a striking landscape of boggy, open upland carpeted with heather and bracken, is home to some of the last breeding pairs of hen harriers in England.
In most cases, extracting oil involves chopping down the forest that blankets the region, draining the boggy ground, stripping off the topsoil and literally digging up the oily sand below.
Within woodland, it prefers wet places or boggy ground, and avoids calcareous (chalky) soils.
