Which preposition to use with truncate

at Occurrences 6%

Truncated at half its height, it stands on the edge of the cliff, a far-off beacon to travellers by land and sea.

as Occurrences 1%

The plan of Fort Sumter may be briefly described as five-sided, with each angle just so much truncated as to give room for one embrasure in every story.

in Occurrences 1%

Head depressed, truncated in front, covered with minute ovate scales; the front of the upper part lead-coloured, with a rather broad red band a little before the eyes, and a white crescent-shaped spot on each side immediately behind it, and then some obscure red shades just behind that; the back lead-coloured and blue, with six longitudinal series of irregular-sized red spots; belly whitish; tail rather longer than the body.

near Occurrences 1%

They were on the brow of a stony hill: a pile of bare, gray, glaring, treeless, herbless layers of rock; a pyramid truncated near its base, but still of majestic altitude; one of the pyramids of nature in that region; in short, a butte.

on Occurrences 1%

Indusium short, truncate on the free side.

Which preposition to use with  truncate