Pokasty/Pokasta

My Pokasta/Pokasty family came in 1876 from Bohemia and settled in Quarry, Marshall, Iowa. I have never found a town of origin for them in Bohemia. However, I do know that they worked in a quarry in Bohemia before they came to the US and worked in the quarry in Quarry, Marshall, Iowa after they immigrated. I’m wondering if many of the Bohemian families in Quarry came from the same town and immigrated as a group to work in the quarry in Iowa. Does anyone have Bohemian ancestors who lived in Quarry, Iowa who could help?

Thanks for your help.

Barb