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Let p be an odd prime number. Classically, the Gross- Koblitz formula expresses the product of specific p-adic gamma values in terms of Gauss sums. As a result, we obtain the algebraicity of particular p-adic gamma values. On the function field side, Thakur introduced the so-called “arithmetic” Gauss sums and derived a Gross-Koblitz-type formula for v-adic arithmetic gamma values. In this talk, we introduce the “geometric” Gauss sums over function fields, and present the geometric version of Gross-Koblitz formula. The primary key to our proof will also be discussed if time permits.