Caption: Pontiac's Silverdome is not the place you expect to see a line of horsemen - at least not those on real horses. But Thursday the arena, best known for its football matches, became a practice area for members of Detroit's Mounted Policemen unit, who go over their formation riding in anticipation of an appearance a the Midewest Horse-a-rama Sunday. The even will run from 1:30 to 6 p.m. at the Silverdome with competitive events and exhibitions. Admission is $5 for adults and $1 for children under 12.
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