The Wild Horse Dilemma by Bonnie Gruenberg quotes a former Chincoteague resident that due to the decimation of the feral herds after the Ash Wednesday storm of 1962 select mares with good conformation were bred to stallions of other breeds including Quarter Horse.
Quarter Horse Stallion at Pony Penning 1984. Photo courtesy of Deb Noll.
A buckskin Quarter Horse stallion was donated to the fire company in 1980 by a farrier. The stallion was photographed as a member of the feral herd through 1989. He led the Pony Swim in 1981 and 1984. He sired foals and the mare Black Silk Stockings appears to be one of his offspring. He likely has descendants in the current herd, however they are currently untraced.