Sundhnúkur Crater Row eruption, Iceland...
5 videos
At 11:14 PM, local time, on 20 November 2024, a fissure eruption started in southwestern Iceland's Reykjanes Peninsula. It was preceded by a relatively minor earthquake swarm. The active fissure...
1911 Christmas Seals
14 photos
Comets
8 photos
Planetary Geology
2 photos
Catholic Seals
2 photos
Guinea-Bissau Postage Stamps
1 photo
Precancelled Stamps
5 photos
Parcel Post Stamps
11 photos
Abraham Lincoln
10 photos
Benjamin Franklin
8 photos
George Washington
9 photos
Marshall Sandstone (Lower Mississippian;...
7 photos
White Pine Mine (Upper Peninsula of Michigan, USA)
40 photos
Overrun Countries Postage Stamps (1943-1944)
13 photos
Transportation Series Postage Stamps (1981-1995)
64 photos
Revenue Stamps
11 photos
Proofs
5 photos
Fiji Postage Stamps
1 photo
Discontinued Post Office (DPO) Covers & Cancels
53 photos
Israel Postage Stamps
1 photo
Great Britain Postage Stamps
2 photos
Special Cancellations, Event Covers, First Day...
26 photos
Nuclear Ship Savannah
19 photos
New Zealand Postage Stamps
4 photos
Barbados Postage Stamps
1 photo
Geology & Postage Stamps
27 photos
Minerals - Sulfates (Hexahydrite)
4 photos
St. Vincent & the Grenadines Postage Stamps
2 photos
Liberia Postage Stamps
1 photo
Antigua & Barbuda Postage Stamps
1 photo
Marshall Islands Postage Stamps
1 photo
Grenada Postage Stamps
1 photo
Gambia Postage Stamps
1 photo
Onondaga Limestone (Middle Devonian; New York...
27 photos
Sediment Sizes & Sediment Shapes
10 photos
Sediments are defined as naturally-occurring, loose grains of any composition or origin at the Earth's surface (although they also occur in cave passages). Most sediments are lithogenous - they form...
Guyana Postage Stamps
6 photos
Ukraine Postage Stamps
26 photos
Cyprus Postage Stamps
1 photo
Iran Postage Stamps
3 photos
Cayman Islands Postage Stamps
6 photos
Sheen Obsidian
20 photos
Gray Obsidian
46 photos
Rainbow Obsidian
4 photos
Snowflake Obsidian
25 photos
Elements
184 photos
Bermuda Postage Stamps
4 photos
Montserrat Postage Stamps
3 photos
Cuba Postage Stamps
23 photos
Ras al Khaima Postage Stamps
14 photos
Australia Postage Stamps
1 photo
Bahrain Postage Stamps
1 photo
Chile Postage Stamps
4 photos
British Antarctic Territory Postage Stamps
12 photos
Ajman Postage Stamps
9 photos
Fujeira Postage Stamps
42 photos
Khor Fakkan Postage Stamps
6 photos
Manama Postage Stamps
8 photos
French Southern & Antarctic Territory Postage...
20 photos
Australian Antarctic Territory Postage Stamps
18 photos
North Korea Postage Stamps
61 photos
Umm al Qiwain Postage Stamps
24 photos
Sharjah Postage Stamps
13 photos
Germany Postage Stamps
41 photos
United States of America Postage Stamps
160 photos
Confederate States of America Postage Stamps
6 photos
Bahamas Postage Stamps
35 photos
Postal History
17 photos
Gorman Nature Center (Mansfield, Ohio, USA)
13 photos
Keokuk Chert (Keokuk Formation, Lower...
31 photos
Chert is a siliceous, microcrystalline to cryptocrystalline sedimentary rock. It typically forms nodules or discrete beds. Some chert is biogenic in origin (e.g., radiolarian cherts), but it can...
Hanover Cemetery (Hanover, Ohio, USA)
16 photos
Portulaca (Purslanes)
10 photos
Helianthus (Sunflowers)
15 photos
Chrysanthemum (Garden Mums)
12 photos
Zinnia
7 photos
Dianthus ("Pinks" and "Sweet Williams")
19 photos
Tagetes (Marigolds)
11 photos
Viola (Garden Pansies)
6 photos
Portugal area Earthquakes
2 photos
Sundhnúkur Crater Row eruption, Iceland...
3 photos, 22 videos
At 9:25 PM, local time, on 22 August 2024, a fissure eruption started in southwestern Iceland's Reykjanes Peninsula. It was preceded by numerous minor earthquakes. As with previous eruptions in...
Christmas Seals
121 photos
Nature Seals
2 photos
Easter Seals
8 photos
Rudbeckia hirta (black-eyed susans)
11 photos
Hoya carnosa (wax plants)
3 photos
Belamcamda chinensis (blackberry lilies)
9 photos
Lychnis coronaria (rose campion)
3 photos
Syria Earthquakes
2 photos
Flood Group (Midway Geyser Basin, Yellowstone,...
211 photos, 7 videos
Wisconsin Earthquakes
1 photo
Alnoite
3 photos
Vietnam Earthquakes
1 photo
Castle Group (Upper Geyser Basin, Yellowstone,...
1051 photos, 115 videos
Pink Cone Group (Lower Geyser Basin, Yellowstone...
436 photos, 43 videos
Unnamed hot spring complex 31 meters ~south of...
4 photos
Gladiolus
11 photos
Unnamed hot spring WSW of Black Opal Pool...
2 photos
Unnamed geyser just west of Prawn Geyser (Great...
1 video
Prawn Geyser (Great Fountain Group, Lower Geyser...
6 videos
Geysers are hot springs that episodically erupt columns of water. They occur in few places on Earth. The highest concentration of geysers anywhere is at the Yellowstone Hotspot Volcano in...
Little Hucker Geyser (Geyser Hill Group, Upper...
1 video
Unnamed geysers near Singlet Geyser (Geyser Hill...
1 photo
Unnamed perpetual spouter on the southwestern...
18 photos, 2 videos
Heisey Glass - Emerald
6 photos
Heisey Glass - Ivorina Verde
1 photo
Heisey Glass - Canary
1 photo
Heisey Glass - Alexandrite
8 photos
Heisey Glass - Ruby
7 photos
Heisey Glass - Tangerine
5 photos
Heisey Glass - Cobalt (Stiegel Blue)
7 photos
Heisey Glass - Opal (Milk Glass)
13 photos
Heisey Glass - Custard
8 photos
Heisey Glass - Sahara
9 photos
Heisey Glass - Moongleam
5 photos
Heisey Glass (Newark, Ohio, USA)
156 photos
Snowglobe Geyser (Geyser Hill Group, Upper Geyser...
9 photos
Snow Globe Geyser is a multivent feature that was first reported erupting on 7 June 2023. It is located about four to five meters south of Doublet Pool's eastern margin. The area formerly consisted...
Witches Cauldron (Grand Group, Upper Geyser...
1 photo
Witches Cauldron is a geyser along the northeastern banks of the Firehole River in the western Grand Group of Yellowstone's Upper Geyser Basin. It is an irregularly-shaped, blue water-filled pool...
Coronet Geyser (Geyser Hill Group, Upper Geyser...
1 photo
Venezuela Earthquakes
1 photo
Ohio River (Ohio-Kentucky-Indiana, USA)
15 photos
Cumberland River (Kentucky-Tennessee, USA)
11 photos
Oil Creek (northwestern Pennsylvania, USA)
4 photos
Straight Creek (southern Ohio, USA)
22 photos
Aroona Creek (South Australia)
23 photos
Enorama Creek (South Australia)
10 photos
Murray River (Australia)
6 photos
Clear Creek (northern Wyoming, USA)
19 photos
Missouri River (USA)
13 photos
Toklat River (Alaska, USA)
5 photos
Chinle Wash (Arizona, USA)
2 photos
Hot Creek (eastern California, USA)
46 photos
Big Walnut Creek (central Ohio, USA)
7 photos
Flat Fork (southwestern Ohio, USA)
26 photos, 4 videos
Stillwater River (Montana, USA)
24 photos
Big Sioux River (South Dakota, USA)
13 photos
Badwater Creek (Wyoming, USA)
5 photos
Walhonding River (eastern Ohio, USA)
4 photos
Hamilton's Store (Yellowstone, Wyoming, USA)
17 photos
Calida Pool (Calida Spring) (Grand Group, Upper...
2 photos
Calida Pool, also known as Calida Spring, is a non-erupting hot spring in the western Grand Group (also known as the Bush Group) of the Upper Geyser Basin in Yellowstone, Wyoming, USA. It is...
Pennsylvania Earthquakes
1 photo
Little Colorado River (Arizona, USA)
4 photos
Colorado River (southwestern USA)
4 photos
Wind River (Wyoming, USA)
7 photos
Rock Creek (Beartooth Mountains, Montana, USA)
2 photos
Hellroaring Creek (Beartooth Mountains, Montana,...
10 photos, 1 video
Gooseberry River (Minnesota, USA)
24 photos
Pike River (Minnesota, USA)
2 photos
St. Croix River (Minnesota, USA)
8 photos
Symmes Creek (Muskingum County, Ohio, USA)
8 photos
Mississippi River (USA)
14 photos
South Dakota Earthquakes
1 photo
Sundhnúkur Crater Row eruption, Iceland...
1 photo, 39 videos
At 12:46 PM, local time, on 29 May 2024, a fissure eruption started in southwestern Iceland's Reykjanes Peninsula, at Sundhnúkur Crater Row, north-northeast of the town of Grindavik. As with...
Goldstone
29 photos
St. John's Lutheran Church Cemetery (Wytheville,...
7 photos
Old Guide's Cemetery (Mammoth Cave National Park,...
5 photos
Mammoth Cave Cemetery (Flint Ridge, Kentucky, USA)
8 photos
Cedar Hill Cemetery (Newark, Ohio, USA)
31 photos
Bishop Seybert Cemetery (Flat Rock, northern...
8 photos
Bulgaria Rocks & Minerals
11 photos
Trails made by variable coquina clams (Donax...
20 photos
Rumurutiites (R-Chondrites)
5 photos
Algeria Rocks
11 photos
Minerals - Silicates (Natrolite)
1 photo
Laguna Agate (Mexico)
12 photos
Minerals - Silicates (Mesolite)
1 photo
Minerals - Silicates (Rhodonite)
1 photo
Las Choyas Geode Deposit (near-latest Eocene, ~35...
33 photos
Auroras
14 photos, 2 videos
Romania Rocks, Minerals, Fossils
27 photos
Copper Skulls
16 photos
Pugh Quarry (near Custar, Ohio, USA)
14 photos
Malaysia Minerals
1 photo
Agate (Kentucky, USA)
26 photos
East Timor Rocks & Minerals
1 photo
Minerals - Carbonates (Strontianite)
3 photos
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral...
Stoneco Incorporated Maumee Quarry (town of...
20 photos
Trackside Mileposts & Whistle Boards
33 photos
Sweets
13 photos
Minerals - Carbonates (Andersonite)
2 photos
Minerals - Phosphates (Variscite)
8 photos
Morocco Earthquakes
2 photos
Imiter Silver Deposit (near-latest...
6 photos
Delaware Rocks, Minerals, Fossils
3 photos
Duff Quarry (north of Huntsville, Ohio, USA)
9 photos
Hocking Hills (southeastern Ohio, USA)
79 photos, 2 videos
Korovin Volcano (Aleutian Islands, Alaska, USA)
1 photo
New Hampshire Earthquakes
2 photos
Pass of El Ghor (Mammoth Cave, Kentucky, USA)
32 photos
Mt. Hagafell-Mt. Stóra Skógfell area eruption,...
3 photos, 47 videos
New Jersey Earthquakes
3 photos
Trillium spp.
18 photos
Solution Pockets in Caves
40 photos
Aesculus glabra (Ohio buckeye)
12 photos
The Ohio buckeye is a tree that is native to America's Ohio River Valley area, plus parts of the Great Plains and Southern Appalachians.
Classification: Plantae, Angiospermophyta, Sapindales,...
Dicentra spp. (Dutchman's breeches & squirrel...
12 photos
2024 Earthquakes
219 photos
2023 Earthquakes
321 photos
2022 Earthquakes
380 photos
2021 Earthquakes
295 photos
2020 Earthquakes
49 photos
2019 Earthquakes
4 photos
Arkose
9 photos
Mt. Sýlingarfell area eruption, Iceland...
1 photo, 43 videos
Minerals - Silicates (Milky Quartz)
14 photos
Minerals - Silicates (Smoky Quartz)
30 photos
Louisiana Earthquakes
2 photos
Minerals - Silicates (Amethyst)
133 photos
Minerals - Silicates (Rose Quartz)
21 photos
Conchoidal Fracture
19 photos
Sanibel-Captiva Conservation Foundation's Native...
217 photos
Brazil Earthquakes
2 photos
Hagafell-Grindavik eruption, Iceland (January...
2 photos, 45 videos
At 7:57 AM, local time, on Sunday, 14 January 2024, a fissure eruption started in southwestern Iceland's Reykjanes Peninsula, just northeast of the town of Grindavik. The fissure quickly lengthened...
Elk
14 photos
Czech Republic (Bohemia) Rocks and Fossils
49 photos
Oklahoma Earthquakes
4 photos
Thuja spp. (arborvitaes)
21 photos
San Gabriel Anorthosite Complex (Mesoproterozoic,...
7 photos
Siltstone
24 photos
Maryland Earthquakes
1 photo
Cockles (Mollusca, Bivalvia, Cardiidae)
33 photos
"Greek Green Porphyry" (glomeroporphyritic...
2 photos
Greece Rocks & Minerals
12 photos
Oysters (Mollusca, Bivalvia, Ostreidae)
14 photos
Arkansas Earthquakes
1 photo
Columbines
9 photos
David St. John's photos
88 photos
Svartsengi-Grindavik eruption, Iceland (December...
6 photos, 38 videos
Woodpeckers & Flickers
23 photos
Sea Gulls
15 photos
Squirrels & Chipmunks
39 photos
Nebraska Earthquakes
1 photo
Obituaries
2 photos
Philippines Rocks & Geology
27 photos
Mussels (Mollusca, Bivalvia, Mytilidae)
42 photos
Taxodium (cypress trees)
24 photos
Metasequoia glyptostroboides (dawn redwood trees)
13 photos
Fossil Cabin (Como Bluff, Wyoming, USA)
35 photos, 1 video
Chunky Gal Complex (Ordovician, ~458 Ma; Blue...
4 photos
Cetacean Fossils (Whales, Dolphins, Porpoises)
29 photos
Lingulid Brachiopods
15 photos
Dolomitic Marble
6 photos
Coal Balls
3 photos
Precious Red Coral
25 photos
Ohio Meteorites
45 photos
Devil's Churn (coastal Oregon, USA)
37 photos
Tillamook Bay (Oregon, USA)
12 photos
Tillamook Bay is a moderately large estuary in northwestern Oregon. Marine water enters the bay from the Pacific Ocean and freshwater enters via several rivers. The salinity ranges from fully...
Oregon Coast Scenic Railroad (Garibaldi-Rockaway...
38 photos
Sea Slugs
10 photos
Thermal Streams
185 photos
Ceylon / Sri Lanka Rocks & Minerals
45 photos
Green Bubbler Geyser (Sapphire Group, Upper...
1 video
Cobble-boulder marine shoreline (Yaquina Head,...
58 photos
Arabian Peninsula area Rocks
4 photos
Arabian Peninsula area Earthquakes
1 photo
Yaquina Head (coastal Oregon, USA)
192 photos
Trains (Videos)
84 videos
Heceta Head Beach (coastal Oregon, USA)
60 photos
Marine beach sediments (Heceta Head Beach,...
18 photos
Glomeroporphyritic Rocks
8 photos
Sea Stacks
10 photos
Yachats Basalt (Upper Eocene, ~36-37 Ma; western...
56 photos
El Cajete Pumice (Valles Rhyolite, Upper...
12 photos
Lahars ("Volcanic Mudflows")
20 photos
Cape Creek (coastal Oregon, USA)
11 photos
Oregon Rivers & Streams
49 photos
Palisade Rhyolite (Mesoproterozoic, 1096-1097 Ma;...
18 photos
Portland, Oregon, USA
20 photos
Mount Hood Volcano (Cascade Range, Oregon, USA)
14 photos
Sandy River (Oregon, USA)
32 photos
Multnomah Falls (Multnomah County, Oregon, USA)
8 photos
Horsetail Falls (Multnomah County, Oregon, USA)
7 photos
Meteorites
275 photos
"Meteor-Wrongs"
12 photos
Meteorites are rocks from space. Most are from the Asteroid Belt, but some are from the Moon and Mars.
"Meteor-wrongs" are rocks that are NOT meteorites. Many folks enthusiastically...
Tar Sands & Tar Sandstones
20 photos
Columbia River Flood Basalt (Miocene, ~15-17 Ma;...
74 photos
Columbia River Gorge (Oregon-Washington border,...
17 photos
Mt. Longonot Volcano (East African Rift Valley,...
8 photos
Southwestern Kenya's Mt. Longonot Volcano is in the East African Rift Valley, along which the African continent is being ripped apart by the Afar Hotspot. Quite a few volcanoes having unusual lava...
Jade
83 photos
Pele's Hair
14 photos
Lapilli & Lapillistone
118 photos, 1 video
Ascension Hotspot (equatorial South Atlantic...
3 photos
Minerals - Silicates (Vermiculite)
3 photos
Minerals - Borates (Ulexite)
1 photo
Italy Earthquakes
2 photos
Warren Rupp Observatory & Hidden Hollow (near...
40 photos
Chile Ridge Earthquakes
4 photos
Indonesia Rocks, Minerals, Fossils
38 photos
Old geyserite mound (Fountain Group, Lower Geyser...
4 photos
Gibbon Meadow Geyser (Gibbon Geyser Basin,...
4 photos, 1 video
Unnamed hydrothermal feature SSW of Ledge Geyser...
5 photos
White Creek (Lower Geyser Basin, Yellowstone,...
23 photos
Absaroka Range (northwestern Wyoming, USA)
44 photos
Unnamed fumarole (Fountain Group, Lower Geyser...
1 photo
Oatmeal Geyser (UNNG-GHG-17a) (unnamed geyser 28...
8 photos
Bison spp. (modern & fossil buffalo species)
81 photos
Shishaldin Volcano (Aleutian Arc, southern...
70 photos, 7 videos
Gooseberry Badlands (Willwood Formation, Lower...
8 photos
Geldingadalur Valley eruption, Iceland (March to...
6 photos, 194 videos
Meradalir Valley eruption, Iceland (August 2022)
29 videos
Litli Hrútur eruption, Iceland (July 2023)
2 photos, 52 videos
Steamboat Point (Yellowstone Lake, Wyoming, USA)
10 photos
Unnamed hot spring south of Jagged Spring (Black...
3 photos
Active fracture south of Jagged Spring (Black...
1 photo
Myriad Group (Upper Geyser Basin, Yellowstone,...
139 photos, 5 videos
Grand Group (Upper Geyser Basin, Yellowstone,...
1820 photos, 100 videos
Sawmill Group (Upper Geyser Basin, Yellowstone,...
1606 photos, 78 videos
Geyser Hill Group (Upper Geyser Basin,...
3057 photos, 225 videos
Round Spring Group (Upper Geyser Basin,...
90 photos, 10 videos
Orange Spring Group & South Orange Spring Group...
81 photos, 2 videos
Giant Group (Upper Geyser Basin, Yellowstone,...
369 photos, 24 videos
Grotto Group (Upper Geyser Basin, Yellowstone,...
431 photos, 11 videos
Chain Lakes Group (Upper Geyser Basin,...
84 photos
Daisy Group (Upper Geyser Basin, Yellowstone,...
361 photos, 67 videos
Punch Bowl Group (Upper Geyser Basin,...
108 photos, 2 videos
Morning Glory Group (Upper Geyser Basin,...
375 photos, 2 videos
Cascade Group (Upper Geyser Basin, Yellowstone,...
370 photos, 18 videos
Old Road Group (Upper Geyser Basin, Yellowstone,...
350 photos, 22 videos
Sapphire Group / Biscuit Basin (Upper Geyser...
1139 photos, 72 videos
Black Sand Basin (Upper Geyser Basin,...
1128 photos, 68 videos
Erigeron spp. (fleabanes)
7 photos
Shoshone River (northwestern Wyoming, USA)
22 photos
Firehole River (Yellowstone, Wyoming, USA)
113 photos, 3 videos
Driveway Spring (Black Sand Basin, Upper Geyser...
6 photos
Lilium sp. (Lilies)
28 photos
Yellowstone River (Wyoming-Montana, USA)
48 photos
Unnamed geyser ~8 meters northeast of Shell...
3 photos
West Yellowstone, Montana, USA
11 photos
Solar Farms & Solar Fields
1 photo
Iron Spring Creek (Iron Creek) (Yellowstone,...
29 photos
Yellowstone Lake (Wyoming, USA)
14 photos, 1 video
Madison River & Madison Canyon (Wyoming-Montana,...
18 photos
Old Faithful Inn (Yellowstone, Wyoming, USA)
32 photos
Gibbon River (Yellowstone, Wyoming, USA)
86 photos, 3 videos
Lower Falls (Grand Canyon of the Yellowstone...
29 photos, 1 video
Lewis Falls (Yellowstone, Wyoming, USA)
1 photo
Tower Falls (Yellowstone, Wyoming, USA)
1 photo, 1 video
Wraith Falls (Yellowstone, Wyoming, USA)
1 photo, 1 video
Undine Falls (Yellowstone, Wyoming, USA)
1 photo, 1 video
Virginia Cascades (Yellowstone, Wyoming, USA)
5 photos, 1 video
Kepler Cascades (Yellowstone, Wyoming, USA)
1 photo, 1 video
Firehole Falls (Yellowstone, Wyoming, USA)
36 photos, 1 video
Upper Falls (Grand Canyon of the Yellowstone...
48 photos, 1 video
Mystic Falls (Yellowstone, Wyoming, USA)
1 photo, 1 video
Rustic Falls (Yellowstone, Wyoming, USA)
1 photo, 1 video
Gibbon Falls (Yellowstone, Wyoming, USA)
19 photos, 1 video
Yooperlite
12 photos
Rimstone
18 photos
Duffin Limestone (Middle Devonian; Kentucky, USA)
2 photos
Big Clifty Sandstone (Upper Mississippian;...
12 photos
Meleagris gallopavo (wild turkeys)
48 photos
Rock Bolts
8 photos
Petunias
24 photos
Rochester Shale (Middle Silurian; New York State,...
4 photos
Minerals - Silicates (Chrysoprase)
12 photos
Sericho Meteorite
8 photos
Brenham Meteorite
8 photos
Seymchan Meteorite
9 photos
Kossuth Meteorite (Octahedrite)
24 photos
Fukang Meteorite (Pallasite)
3 photos
Odessa Meteorite (Octahedrite)
2 photos
Canyon Diablo Meteorite (Octahedrite)
6 photos
New Concord Meteorite (Ordinary Chondrite)
17 photos
Murchison Meteorite (Carbonaceous Chondrite)
2 photos
Allende Meteorite (Carbonaceous Chondrite)
14 photos
Chelyabinsk Meteorite (Ordinary Chondrite)
2 photos
Nantan Meteorite (Octahedrite)
23 photos
Sikhote-Alin Meteorite (Octahedrite)
2 photos
Gibeon Meteorite (Octahedrite)
22 photos
Pahasapa Limestone (Lower Mississippian; Black...
75 photos
Boyle Formation / Boyle Dolomite (Middle...
19 photos
Megasequence Boundaries (= Sloss Sequence...
100 photos
Gunflint Formation (Gunflint Chert)...
8 photos
Paraconformities
4 photos
Montana Earthquakes
6 photos
Bleeding Unconformities
26 photos
North Vernon Limestone (Middle Devonian; Indiana,...
7 photos
Florida Rocks & Fossils
86 photos
False Earthquakes
2 photos
New York State Earthquakes
2 photos
Atlantic Ocean Earthquakes (away from mid-ocean...
2 photos
Migmatite
42 photos
Rock House (Black Hand Sandstone, Lower...
15 photos
Mining & Quarrying
3 photos
Dandelions
11 photos
Offshore Western Canada Earthquakes
6 photos
Iron Mountain mining complex (west of Cedar City,...
12 photos
Dinosaurs (Plateosaurs)
2 photos
Wyoming Rocks, Minerals, Fossils
971 photos, 2 videos
Zuni-Bandera Volcanic Field (Upper Cenozoic; New...
21 photos
Talc Schist
14 photos
Afghanistan Earthquakes
8 photos
Ecuador Earthquakes
1 photo
Holder Formation (Upper Pennsylvanian; New...
22 photos
Denver Formation (Cretaceous-Tertiary; Colorado,...
48 photos
Colorado Earthquakes
2 photos
Slovenia Rocks & Minerals
12 photos
Rio Grande Rift Valley (New Mexico-Colorado, USA)
5 photos
Hollinger Mine (Timmins, Ontario, Canada)
8 photos
Four Corners Mine (Dakota Hogback, southwest of...
10 photos
Cerith snails (Mollusca, Gastropoda, Cerithiidae)
14 photos
Sulawesi area Earthquakes
2 photos
Kentucky Earthquakes
9 photos
Bastite
13 photos
Korea Earthquakes
3 photos
Crocodilian Fossils
34 photos
Tarns & Pater Noster Lakes
11 photos
Shovels
48 photos
Diplocraterion trace fossils
7 photos
Jewelbox clams (Mollusca, Bivalvia, Chamidae)
24 photos
Quad Creek (Beartooth Mountains, southwest of Red...
65 photos
True conchs (Mollusca, Gastropoda, Strombidae)
74 photos
Florida Seashells
297 photos
Jingle shells (Mollusca, Bivalvia, Anomiidae)
6 photos
K2 Stone ("K2 Jasper") (Himalayan Mountains of...
12 photos
"Dendritic Agate"
11 photos
Lubin Copper Mine (Poland)
9 photos
Magma Mine (Superior, Arizona, USA)
2 photos
North Star Mine (Beartooth Mountains, southern...
45 photos
Kidd Creek Mine (north of Timmins, Ontario,...
2 photos
Sunstone
28 photos
Idaho Springs Formation (Paleoproterozoic, ~1.7...
25 photos
Broadway Avenue & Methodist Church (Mammoth Cave,...
3 photos
Red Rocks Park (west of Denver, Colorado, USA)
226 photos
Minerals - Hydroxides (Brucite)
5 photos
Hidden River Cave (Horse Cave, Kentucky, USA)
27 photos
Staddens Bridge gravel bar (Licking River, east...
4 photos
Turkey Earthquakes
16 photos
Frost Polygons
12 photos
Solomon Trench / San Cristobal Trench area...
9 photos
Streptocarpus sp. (Cape primrose)
5 photos
Bowtie Arch (west of Moab, Utah, USA)
36 photos
Bowtie Arch a pothole-type natural arch located west of Moab, Utah. It is not in Arches National Park, which is northeast of here.
Rock arches are rare features - they form by differential...
Corona Arch (west of Moab, Utah, USA)
39 photos
Corona Arch, also known as Little Rainbow Bridge, is located west of Moab, Utah. It is not in Arches National Park, which is northeast of here.
Rock arches are rare features - they form by...
Himalayan Earthquakes
5 photos
Lau Basin-Lau Ridge area Earthquakes
14 photos
Pleistocene terrace alluvium gravel (above the...
9 photos
Desert Varnish
157 photos
Jasper & botryoidal jasper ("Red Grape Agate")...
22 photos
Corona Arch Trail (west of Moab, Utah, USA)
306 photos
Romania & Slovakia Earthquakes
6 photos
Geology, History, Archaeology, Biology of Mammoth...
1518 photos, 12 videos
Wondering Woods Cave (Mammoth Cave National Park,...
3 photos
Sardinia Rocks
3 photos
Cyprus Rocks
1 photo
Sicily Rocks, Minerals, Fossils
39 photos, 1 video
Corsica Rocks
5 photos
Monument Rocks & chalk badlands (Smoky Hill Chalk...
188 photos
Mary Ellen Jasper (Biwabik Iron-Formation,...
47 photos
Henry Mountains (southeastern Utah, USA)
6 photos
Entrada Sandstone (upper Middle Jurassic; western...
370 photos
Wild Horse Butte (near Goblin Valley, Utah, USA)
21 photos
Rock Creek Canyon (Beartooth Mountains, Montana,...
167 photos, 1 video
Hellroaring Road (Beartooth Mountains, Montana,...
101 photos, 2 videos
Goblin Valley (Utah, USA)
340 photos
Minerals - Oxides (Pyrolusite)
3 photos
Indian Ricegrass (Oryzopsis hymenoides) (western...
16 photos
Guadalupe Mountains National Park (Texas, USA)
54 photos
Silver Islet Mine (Lake Superior, Ontario, Canada)
6 photos
Naturally Polished Rocks
70 photos
Percussion Marks & Percussion Cones
30 photos
Albania Rocks
2 photos
Contraluz Opal
8 photos
Stillwater Mine (Beartooth Mountains, Montana,...
34 photos
Sylvinite (halite-sylvite evaporite rock)
30 photos
Engineering Geology
29 photos
Ireland Rocks & Fossils
16 photos
Old Red Sandstone (Devonian; British Isles)
7 photos
Megaripples
10 photos
Montana Rivers & Streams
126 photos, 1 video
Ship Rock & vicinity (Navajo Volcanic Field, New...
23 photos
Pompey's Pillar National Monument (Montana, USA)
31 photos
Gravestones
65 photos
Gravestones (a.k.a. headstones / tombstones) in modern American cemeteries are usually made of "granite" - a term in the retail trade for any hard stone that will take a fine polish. ...
Idaho Rocks, Minerals, Fossils
407 photos
New Guinea area Earthquakes
13 photos
Blind Arches
44 photos
Ohio Central Railroad
13 photos, 1 video
Norfolk Southern Railway
58 photos, 16 videos
CSX Transportation (= Chessie-Seaboard Expanded)
75 photos, 22 videos
Union Pacific Railroad
39 photos, 1 video
Burlington Northern and Santa Fe Railway
10 photos, 1 video
Alpine Earthquakes
2 photos
Perlite
46 photos
Faceted Fire Opal (Mexico)
9 photos
Puncture Holes
9 photos
Escalante Petrified Forest State Park (southern...
254 photos
Long Valley Volcano & Long Valley Caldera...
308 photos
Caliche (Calcrete; Hardpan)
42 photos
Boulder-dominated marine shoreline (Myponga Beach...
3 photos
Boulder-dominated marine shoreline (Big Gully,...
17 photos
West Virginia Earthquakes
1 photo
Mammut americanum (American mastodon)
145 photos
Seneca Caverns (northern Ohio, USA)
18 photos
Ashfall Fossil Beds (northeastern Nebraska, USA)
201 photos
Valentine Formation (Miocene; Great Plains, USA)
16 photos
Licking River (east-central Ohio, USA)
16 photos
Chalk
469 photos
Niobrara Formation (Upper Cretaceous; western USA)
544 photos
Draperies ("cave bacon")
67 photos
Germany Earthquakes
2 photos
Michigan Earthquakes
1 photo
Coralloids (knobstone; "cave popcorn")
111 photos
"Speleothem" is the technical term for "cave formations", and refers to all secondary mineral deposits in caves. The most common speleothem-forming mineral is calcite (CaCO3 -...
Cactuses
102 photos
Ferns
56 photos
Rock Cut (Pottsville Group, Pennsylvanian;...
162 photos