Circles on the field and other formations. Canada

Date: January 6 1977
Location: Montreal Quebec Canada
Time: 0115A
Summary: Mrs. Florida Malboeuf, about 50, was sitting at her window on the Rue Casgrain when she saw an oyster shaped, flat bottomed metallic object, with a row of white lights around its base, come in from the north and land on the rooftop of a 3 story apartment building across the street, about 60 feet from her. Immediately two figures appeared on the roof, they were very tall and thin (over 6ft.), with long arms, wearing white one piece garments with their heads covered with tight “bath helmets.” They stood looking at the street, then at the sky, then they returned apparently to the object. The moment after they disappeared, the object rose from the roof about 20 feet and went off to the east. Her son Andre went to the roof in question and found on top of the ice and snow there a large elliptical shaped crust of ice, 4/5″ thick, and about 18 feet in diameter, evidently formed by the local melting of the snow. In relief on this plaque and going toward the façade of the building were four small, narrow footprints, only 6.5″ long.
Source: Marc Leduc & Wido Hoville, UFO Quebec