Triangular shaped object stopped over horse pasture in Tahlequah, Oklahoma in 1977

Stopped on North Water Street two blocks north of Allen Road. Got out of car because rear seat passenger needed to relieve himself.  I stood in road and looked at stars but saw none in an area over the horse pasture on East side of road.  Looked closer and noticed that the blackness had a triangular shape but there was no light at that time.  Absolutely nothing, like the blackness of a deep cave.  There was no sound but the inside of my chest seemed to notice some kind of reverberation that was almost like minute vacuum with some kind of humming feeling.  It looked to be about 500 to 100 feet over the pasture but it was very hard to tell because it would depend on how large it was. 
A light came on to the north side at the tip of the triangle that had the flattened edge.  The light seemed to get brighter until you could see it's beam for at least a mile.  The object barely moved forward to the north and almost in a logrhymithic rate continued to speed up to the north.  We watched it move about a mile and followed it to the T in the road where it turned left toward Tulsa and you could see a glow that seemed to envelope the entire object and it kept climbing to the west.  
We had to stop near the Grand View school and watched it for what seemed about twenty to fifty miles (about two minutes)until we could no longer see the glow.  Not exactly sure of the date but the time of day is very close.  
Do believe it was November of 1977 because it was close to Thanksgiving.
Witness indicates that the date of the sighting is approximate.  PD