Vulkaner.no collects volcano news, eruption stories, webcams, hazards, geology links and field photographs in the style of an older specialist portal built by somebody who kept following the subject for years.
The Virtual Cave is a long-running photographic guide to cave formations, ice caves, sea caves, lava tubes, speleothems, and underground geology, created in the 1990s and expanded into a specialist visual reference.
NiagaraFrontier.com preserves a detailed chronology of the 1969 dewatering of the American Falls, when engineers diverted the river, built a cofferdam, studied the rock face, recovered debris and bodies, and let visitors walk onto the exposed riverbed.
Mike Everhart's Kiowa Shale page documents a 2011 fossil trip with specimen numbers, field photographs, geological context, plesiosaur bones, historical collections, and references.
RockTumbler.com's detailed tumbling instructions turn a simple hobby into a practical reference on rock hardness, grit contamination, barrel loading, polishing, burnishing, and record keeping.
FlintSource.NET has spent 25 years documenting flint, chert, radiolarite, quartzite and obsidian sources with photographs, coordinates, geology and field notes.
The Natural Arch and Bridge Society turned its website into a serious field reference for natural arches, measurements, discoveries, expedition reports, and preservation work.
The Primary Water Institute is a surviving example of the Web as a home for minority scientific claims: a polished advocacy archive arguing that large usable water supplies rise from deep within Earth rather than mainly coming from precipitation-fed groundwater.
Boris Behncke's Italy's Volcanoes has been online since 1995 and was intentionally left largely in its old form, preserving a specialist geology site instead of repeatedly redesigning it into oblivion.