Comprehensible geological strata? I live in Massachusetts a complex continental pressed-together fringe where the rocks are crushed and hard to figure, it is not easy for this totally amateur dilettante to discombobulate, unlike the flattened strata of upstate NY and other inland sendimental inland areas here in USA , but a the Helderburg exposure seen above Altamont, NY at Thatcher's Park, so classic Ordovician-Silurian Gondwana, Agassiz worked here in the day, it is exposed so well anybody can come and heck you may find a trilobite. If you want a trilobite fossil come to NY, we got plenty come here with digging tools and look.