. Guide leaflet. PODOKESAURUS. RHYTIDODON Certain types of dinosaurs of Triassic age which inhabited the New York, Virginia andConnecticut valley basins. intruded. But they are not all of the same age or kind. There aregranitic stringers and sills which may date back to the close of the earliestof these sedimentary periods, since they partake of all the metamorphicchanges that characterize these ancient strata including recrystalliza-tion and flowage. The most striking examples are the Yonkers granite-gneiss, a sill, and the Ravenswood granodiorite, a boss. Some of thepegmatitic streaks and ba
. Guide leaflet. PODOKESAURUS. RHYTIDODON Certain types of dinosaurs of Triassic age which inhabited the New York, Virginia andConnecticut valley basins. intruded. But they are not all of the same age or kind. There aregranitic stringers and sills which may date back to the close of the earliestof these sedimentary periods, since they partake of all the metamorphicchanges that characterize these ancient strata including recrystalliza-tion and flowage. The most striking examples are the Yonkers granite-gneiss, a sill, and the Ravenswood granodiorite, a boss. Some of thepegmatitic streaks and basic intrusions belong to a period of more exten-sive metamorphic activity and penetrate the Inwood dolomite and Man-hattan schist. Examples are the Harrison diorite, basic dikes, graniticdikes, bosses, and intrusions as shown on the accompanying geologicmap, pages 14-15. The serpentine which is found at Hoboken and over alarge part of Staten Island is a metamorphic alteration product derivedfrom similar basic intrusions. The e
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