I googled for you and look what I found
on Amazon:
The Rocky Mountain Berry Book (Berry Books) (Paperback)
by Bob Krumm (Author)
Book Description
Wild berry lovers, here is your book! The Rocky Mountain Berry Book is the only book that combines the information of a field guide and the fun of a cookbook. Author Bob Krumm tells you in a friendly, non-technical way, how to identify fifteen edible fruits and berries. Chokecherry, elderberry, wild raspberry, huckleberry-all your favorites are here. Plus several you might not have known were edible and delicious, such as wild rose and hawthorn. You'll learn what these plants look like and where they grow. You'll learn when they ripen. And you'll learn the best methods of picking and preserving these luscious wild fruits at their peak of flavor. And that's not all. The Rocky Mountain Berry Book includes 148 delicious recipes, from jellies and preserves, to pies and cakes, to Native American favorites such as pemmican. So stock your pantry while you savor the beauty of the Rockies. The Rocky Mountain Berry Book tells you how!
From the Back Cover
The Rocky Mountain Berry Book combines the information of a field guide and the fun of a cookbook. Learn to identify 15 berry and fruit species using non-technical descriptions, habitat hints, and color photos.
Personally I've no clue what your berry could be, but I bet it's in this book. Perhaps your library has it or can get it.
good luck