Whilst riding on Mam Tor in Castleton, England I came across this scene (not my photo) and I would like to know what causes the formations which I have ringed in red. They look like piles of earth have been deposited a long time ago, but clearly that can't be the case, so what causes them?
They're landslide deposits; Mam Tor gets its name, which translates as "mother hill", from the regular landslides that come off the higher slopes and form hillocks further down into the valley.
*edited: actual agreement is they are landslides
I think that forms are drumlins
The drumlins are elongated hills with their major axis parallel to the direction of ice movement. They have the shape of an inverted spoon or a semi-ellipsoid more or less elongated. Its length ranges between 10 and 3,000 meters, the height is between 5 and 50 meters and the width has variable dimensions depending on its degree of elongation. Its longitudinal profile presents a slope of higher slope upstream.
Zone has glaciar/periglaciar geomorphology, wich would match with my sugestion. The morphology of the forms on the picture matches with the description.