Hi there
I'm from Monterrey, Mexico, and I'm new here.
I'm a biologist (graduated from the Universidad Autonoma de Nuevo Leon), with a speciality in health and food safety but I always had a passion for the prehistoric life (I'm still a amateur on that field).
I recently rediscover some of my old stuff, among other things was thus fossil my uncle bought me when we went to a road trip to Zacatecas (a state known for its minery) along some of the main highways you can find some kind of "giftshops" where you can buy minerals and many different fossils. This one looks like a gastropod, it is pretty wornout, hope someone could help with at least family or genus.