abundant
background
biology
bivalvia
brown
closeup
common
desert
detail
dry
environment
fossil shell
fossilized
fossils
mesozoic
mesozoic era
mollusk
morphology
natural
nature
old
outdoor
paleobiology
paleontologist
paleontology
pattern
riyadh
rock
saudi arabia
science
sea
sea bed
sedimentary
shape
stone
structure
surface
texture
wall