Alan Cressler:
Aquilegia canadensis, Round Bluff, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Big Rocky Hollow Creek, Big Rocky Hollow, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Big Rocky Hollow Falls, Big Rocky Hollow, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Big Rocky Hollow Falls, Big Rocky Hollow, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Ferne Clyffe State Park, Johnson County, Illinois 2
Alan Cressler:
Cystopteris protrusa, Big Rocky Hollow, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Dicentra cucullaria, Big Rocky Hollow, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Dicentra cucullaria, Big Rocky Hollow, Ferne Clyffe State Park, Johnson County, Illinois 2
Alan Cressler:
Dryopteris intermedia, Round Bluff, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Dryopteris intermedia, and Osmundastrum cinnamomeum, Round Bluff, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Dryopteris marginalis, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Happy Hollow Bluffs, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Happy Hollow Bluffs, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Ferne Clyffe State Park, Johnson County, Illinois 2
Alan Cressler:
Happy Hollow Creek, Happy Hollow, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Phacelia bipinnatifida, Big Rocky Hollow, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Phacelia bipinnatifida, Round Bluff, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Phacelia bipinnatifida, Round Bluff, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 2
Alan Cressler:
Phlox bifida, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Phlox bifida, Ferne Clyffe State Park, Johnson County, Illinois 2
Alan Cressler:
Polypodium virginianum, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Polypodium virginianum, Ferne Clyffe State Park, Johnson County, Illinois 2
Alan Cressler:
Primula meadia, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Round Bluff Trail, Round Bluff, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Round Bluff, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 1
Alan Cressler:
Round Bluff, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 2
Alan Cressler:
Round Bluff, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 3
Alan Cressler:
Round Bluff, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 4
Alan Cressler:
Round Bluff, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 5
Alan Cressler:
Round Bluff, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 6
Alan Cressler:
Round Bluff, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 7
Alan Cressler:
Round Bluff, Pennsylvanian Age, Pounds Sandstone Member, Caseyville Formation, Round Bluff Nature Preserve, Ferne Clyffe State Park, Johnson County, Illinois 8
