This area is famous for the early Oligocene Fontainebleau Sandstone formation, a very pure and clean white sandstone that is host to two types of collectible specimens (see Thiry et al, 2015 for a good summary):

1 - Quartzite "pan" concretions cemented by quartz (not calcite) that can show bizarre, botryoidal or "custard-like" shapes known locally as "gogottes". These formed in the Quarternary when groundwater contacted permafrost within river channels incised into the sandstone and then cooled. The quartz cement precipitated as both crystallographically-aligned euhedral overgrowths on quartz grains and as isopachous (aka fortification) layers around the grains.
2 - Sand-included calcite crystals (and ~1 cm spherule concretions) that typically occur as clusters of rhombohedrons. They are also Quarternary and formed concomitantly with the quartzite "pans" as cold, carbon dioxide-rich groundwater infiltrated from above and warmed when it contacted the water table.

Fontainebleau (/ˈfɒntɪnbloʊ/ FON-tin-bloh, US also /-bluː/ -⁠bloo, French: [fɔ̃tɛnblo]) is a commune in the metropolitan area of Paris, France. It is located 55.5 kilometres (ca. 34 mi) south-southeast of the centre of Paris. Fontainebleau is a sub-prefecture of the Seine-et-Marne department, and it is the seat of the arrondissement of Fontainebleau. The commune has the largest land area in the Île-de-France region; it is the only one to cover a larger area than Paris itself. The commune is closest to Seine-et-Marne Prefecture, Melun.

Fontainebleau is renowned for the large and scenic forest of Fontainebleau, a favourite weekend getaway for Parisians, as well as for the historic Château de Fontainebleau, which once belonged to the kings of France. It is also the home of INSEAD, one of the world's most elite business schools.

Fossils

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Other Databases

Wikipedia:	https://en.wikipedia.org/wiki/Fontainebleau
Wikidata ID:	Q182872
GeoNames ID:	6443660

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References