Volunteer cherry tree

Asked July 12, 2018, 3:22 PM EDT

Unknown type cherry tree(s) bearing sour fruit. Color hasn't gone beyond bright red at ripeness. Leaves are medium to dark green, elliptical, with broadest part closer to tip of leaf than to stem. Fruit sIze at ripeness 1/2" to 3/4". Trees are 15 to 20 ft. tall. Can you identify? Want to verify safe to cook with. I know stone, leaves and bark may have toxins. Thanks!
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Jefferson County Colorado

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