Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Sandstone (Quartz Arenite)

Sandstone (SiO2 with possible mineral cements)

Siltstone/Sandstone (possibly Wonderstone or Picture Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide inclusions)

Quartz-bearing granite or pegmatite fragment

Likely granitic material composed mainly of quartz (SiO₂), feldspar, and possibly biotite or hornblende

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly quartz-bearing

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Banded river pebble, likely quartzite or metamorphosed sandstone

Quartzite (quartz-rich metamorphic rock), possibly banded sandstone

Rounded gray-brown river cobble

Indeterminate lithology; possibly weathered quartzite, chert, or fine-grained sandstone

Greywacke

Lithic Wacke

Paving-concrete aggregate with a rounded stone

Polymictic gravel aggregate; the central clast appears to be weathered sandstone or volcanic rock

Rounded yellow-brown river pebble

Indeterminate lithology; possibly weathered sandstone or chert

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz (SiO₂)-rich sandstone; possibly partially metamorphosed quartzite

Rounded granite or granitic gneiss cobble

Granite; primarily quartz, feldspar, and mica (exact identification requires a fresh surface and testing)

Weathered conglomeratic river pebble

Polymictic conglomerate, likely ferruginous chert/sandstone matrix

Fossiliferous Siltstone

Clastic Sedimentary Rock with Fossil Inclusions

Conglomerate with Quartzite Pebbles

Clastic sedimentary rock (Conglomerate)

Coarse-grained granite, possibly granodiorite

Granite–granodiorite; chiefly quartz, alkali feldspar, plagioclase, and mica

Banded gneiss (possibly migmatitic gneiss)

Quartz–feldspar–mica gneiss; composition commonly includes quartz, feldspar, biotite/hornblende, and accessory dark minerals

Water-worn quartzite or sandstone cobble

Quartzite (predominantly SiO₂), possibly quartz-rich sandstone

Weathered conglomeratic volcanic rock

Likely basaltic volcanic breccia or agglomerate, with plagioclase, pyroxene, volcanic glass, and lithic fragments

Sandstone or Mudstone

Sedimentary Rock

Tumbled gray quartzite or chert pebble

Quartzite (microcrystalline SiO₂; possibly chert)

André's Landing Rock (Sandstone Boulder)

Newark Supergroup Sandstone (likely Stockton Formation)

Weathered quartz-rich rock, possibly sandstone or milky quartz

Primarily quartz (silicon dioxide, SiO₂); exact identification is uncertain from the photograph

Weathered granite or granitic gneiss pebble

Granite: quartz + feldspar + mica; possibly weakly foliated gneiss

River Cobble (Quartzite/Granite mix)

Quartzite-rich river stone

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Polished banded gneiss or schist pebble

Banded quartz–feldspar–mica gneiss (tentative)

Pink granite (weathered, possibly pegmatitic)

Felsic intrusive igneous rock; chiefly quartz, potassium feldspar, plagioclase, and minor biotite/hornblende

Light-colored weathered rocks, possibly limestone or quartz-rich stone

Probable limestone/calcitic rock; exact identification is uncertain because strong flash overexposure obscures texture

Weathered rock pebble, possibly quartz-rich sandstone

Uncertain from the image; likely quartz-bearing sandstone with iron-oxide staining

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Quartz-rich sandstone (possibly arkosic sandstone)

Clastic sandstone, mainly quartz (SiO₂) with feldspar and iron-oxide cement

Weathered quartz-rich rock, likely chert or quartzite

Microcrystalline quartz (SiO₂), possibly with iron-oxide staining

Banded Gneiss

Gneiss (Felsic to Mafic Metamorphic Rock)

Quartz-rich metamorphic rock, possibly quartzite

Quartzite; primarily crystalline silicon dioxide (SiO₂), with minor feldspar, mica, or iron oxides

Rounded brown pebble, likely sandstone or weathered iron-rich rock

Indeterminate; possibly ferruginous sandstone (quartz-rich sedimentary rock)

Granite or granitic gneiss pebble

Quartz–feldspar–mica aggregate; likely granite, possibly foliated gneiss

Coarse-grained granite (possibly granodiorite)

Granite, composed chiefly of quartz, feldspar, and mica; exact mineral proportions cannot be confirmed from the photograph.

Orange Quartzite (River Pebble)

Quartzite (SiO2 with iron oxide inclusions)

River Pebble (likely Quartzite or Chert)

Silicon Dioxide (SiO2) crystal conglomerate

Banded gneiss (likely biotite-bearing)

Gneiss; quartz–feldspar–mica assemblage, with possible iron-oxide staining

Banded Sandstone

Quartz-rich Arenite Sandstone