Indeterminate

Weathered brown rock, likely iron-stained sandstone or chert

Indeterminate; probable quartz-rich sandstone/chert with iron-oxide staining

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

Indeterminate; likely calcitic limestone (mostly CaCO₃) or quartz sandstone (SiO₂)

Rounded gray river pebble, likely fine-grained sandstone or siltstone

Indeterminate clastic sedimentary rock; possibly quartz-rich sandstone or siltstone

Unidentified gray rock/mineral specimen

Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen

Weathered metamorphic rock, likely gneiss or schist

Indeterminate foliated silicate rock; commonly quartz–feldspar–mica assemblage

Likely polished dark pebble

Indeterminate; possibly basalt, black jasper, or a dark sulfide-rich stone

Banded sandstone pebble

Quartz-rich sandstone (composition and exact variety indeterminate from the image)

Likely water-worn bone or fossil fragment

Indeterminate fossilized bone; species and age cannot be determined from the image

Fossil shell (likely a brachiopod or bivalve)

Indeterminate fossilized shell; exact taxon cannot be identified from this view

Green cabochon gemstone, likely aventurine or jade

Indeterminate from the image; possible green quartzite (aventurine) or jadeite/nephrite

Possible fossilized bone fragment

Indeterminate vertebrate bone; no taxonomic identification is possible from the image alone

Unidentified gray mineral/rock fragment

Indeterminate from the photograph; possibly a quartz- or feldspar-bearing rock fragment

Fossilized shell

Indeterminate bivalve shell; likely calcitic or aragonitic shell material (CaCO₃)

Likely iron-rich rock fragment

Indeterminate; possibly limonite/goethite-stained rock, with no diagnostic features visible

Possible fossilized bone fragment

Indeterminate mineralized bone; taxon and age cannot be determined from the photo

Weathered dark mineral/rock fragment

Indeterminate; possibly iron-rich basalt, slag, or a sulfide-bearing mineral

White pebble, likely quartz or calcite

Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Small dark mineral or rock fragment

Indeterminate; possibly mica-rich schist, biotite, or a dark sulfide mineral

Small brown mineral/rock fragment

Indeterminate; possibly weathered quartz-rich rock, ironstone, or a sulfide mineral

Fossilized tooth or tooth fragment

Indeterminate vertebrate tooth; possibly a fossil shark tooth (Carcharodon/Carcharocles)

Rounded weathered pebble, likely basaltic or metamorphic

Indeterminate fine-grained mafic rock; possibly basalt or altered basalt

Fossilized tooth fragment, possibly a mammalian tooth

Indeterminate fossil tooth; enamel and dentine, taxon not identifiable from this fragment

Unknown dark mineral/rock fragment

Indeterminate; possibly a dark sulfide mineral or slag-like geological fragment

Weathered iron-rich rock, possibly oxidized basalt or laterite

Indeterminate; likely iron-oxide-bearing mafic rock (basaltic composition)

Fossilized shell, likely brachiopod or bivalve

Indeterminate fossil shell; possible Spiriferida brachiopod or thick-shelled bivalve

Tumbled pale green stone, likely serpentine or jade imitation

Indeterminate; possible serpentine-group mineral (Mg₃Si₂O₅(OH)₄)

Likely quartz-rich pebble

Quartz-bearing granite, granitic gneiss, or quartzite (indeterminate from photo)

Weathered sedimentary cobble, likely limestone or calcareous sandstone

Indeterminate carbonate-rich clastic rock; possibly micritic limestone or calcarenite

Fossilized turtle shell or carapace

Testudines indeterminate; shell mainly fossilized calcium-carbonate bone (apatite)

Unidentified metallic mineral or meteorite fragment

Indeterminate; possible native metal-bearing sulfide or iron meteorite fragment

Fossilized bivalve in sandstone/conglomerate

Indeterminate fossil mollusk, likely Bivalvia, preserved in lithified siliciclastic sediment

Weathered, iron-stained rock (likely sandstone or breccia)

Indeterminate clastic sedimentary rock; possible ferruginous sandstone or weathered breccia

Rounded quartz-rich cobble, possibly quartzite or granitic rock

Indeterminate; likely quartz–feldspar aggregate, potentially weathered granite or quartzite

Likely quartz-bearing rock or mineral fragment

Indeterminate; possibly quartz (SiO₂) with iron-oxide staining and darker matrix

Rounded river pebble, likely quartz-rich sandstone or fine-grained granite

Indeterminate from photograph; possible quartz/feldspar-bearing granitic pebble

Small weathered stone, possibly quartz-rich sandstone

Indeterminate siliciclastic rock; likely quartz-bearing sandstone or chert fragment

Tumbled pale feldspar-rich stone (likely granite or quartzite fragment)

Indeterminate; possible quartz–feldspar aggregate, commonly granite or feldspathic quartzite

Weathered metamorphic rock, possibly schist or gneiss

Indeterminate; likely quartz–feldspar–mica rock, potentially greenschist or gneiss

Weathered iron-rich stone, likely basalt or ironstone

Indeterminate; possibly vesicular basalt (plagioclase–pyroxene) or ferruginous sandstone/ironstone

Weathered fossil fragment, possibly bone

Indeterminate fossilized bone; likely mineralized vertebrate bone (apatite-rich)

Rounded river pebble, likely weathered sandstone or siltstone

Indeterminate clastic sedimentary rock; likely quartz-rich sandstone/siltstone

Rounded weathered stone, likely basaltic or volcanic rock

Indeterminate fine-grained mafic volcanic rock; possibly basalt or andesite