Internet research led me to the website of the National Shell Museum in Florida. It appears these types of shells are also found in the Gulf of Mexico as well as the Sea of Cortes. There’s also an awesome local Shell Museum I visited yesterday. More on that tomorrow!
A circle of Turkey Wing and Mossy Ark shells. The most prevalent shell on one of the beaches here on the Sea of Cortes, but not a type we have back home in the islands of the Salish Sea.