The Oaks Rock Garden

Site 1: Albite-quartz-spodumene-muscovite pegmatite
Author: Late Devonian (~380 Ma)

Site 2: Cordierite-biotite hornfels
Author: Late Cambrian – Early Ordovician (metamorphosed during Devonian)

Site 3: Staurolite-muscovite schist
Author: Late Cambrian – Early Ordovician (metamorphosed during Devonian)

Site 4: Glacial erratic boulder (containing beds of slate and quartzite)
Author: Late Cambrian – Early Ordovician (dropped at Oaks during last ice age)

Site 5: Muscovite-biotite schist
Author: Late Cambrian – Early Ordovician (metamorphosed during Devonian)

Site 6: Muscovite-biotite schist and granite
Author: Schist - Late Cambrian – Early Ordovician (metamorphosed during Devonian); Granite – Late Devonian

Site 7: Gabbro
Author: Late Triassic - Early Jurassic

Site 8: Columnar basalt
Author: Late Triassic - Early Jurassic

Site 9: Porphyritic granitoid
Author: Neoproterozoic

Site 10: Micrite (lime mudstone)
Author: Late Carboniferous

Site 11: Gypsum
Author: Early Carboniferous

Site 12: Sandstone
Author: Late Cambrian – Early Ordovician

Site 13: Quartz arenite sandstone
Author: Late Cambrian – Early Ordovician

Site 14: Marble
Author: Neoproterozoic (~600 Ma)

Site 15: Hydrothermal quartz vein through gabbro
Author: Late Triassic – Early Jurassic (timing of veining unknown)

Site 16: Diroite with granite xenolith
Author: Neoproterozoic (607 ± 2 Ma)

Site 17: Sandstone and granite
Author: Sandstone – Cambrian to Ordovician; Granite - Devonian