Radiolarian-bearing strata and collectors in the wild...
A selection of field scenes and chert exposures from Canada, Alaska, France, Oman, Tunisia, Guadeloupe...
Chenaillet-Montgenevre ophiolite: click here

Nakina mapping project, Atlin, BC

Radiolarian chert and other rock samples in the background... From left to right: Fionnula Devine (Nulaaa), Mitch Mihalynuk (mad dog), Joe English (Shamrock, front), Kyle Larson (pillow-talk), Yann Merran (Yann-le-gars), and FC (Fab)

Middle Jurassic grey ribbon chert locality from the Bridge River complex, British Columbia

Similar sections of x cm-size grey chert-shale couplets are found in Paleozoic and Mesozoic North-American accretion-subduction complexes. Width: 3m.

Metamorphic ribbon chert on Red Mountain gold deposit near Stewart, BC/Alaska border.

Mapping by Charlie Greig and radiolarian collecting by FC on the larger gold deposit of British Columbia. Middle Triassic pyritized radiolarian fauna were recovered from this locality.

Early morning in the Cache Creek terrane

A tribute to Norm Graham, founder and pilot of Discovery helicopters (Atlin) almost visible inside the chopper!

Helicopter drop-off, Stikine region, NW British Columbia.
Permian radiolarian chert on Sentinel Mountain, Cache Creek complex near Atlin, NW British Columbia

Mapping by MaryAnne Bloodgood and Kim Ferry, BC Geological Survey Branch.

Flying over BC Coast Belt

 

 

Block of Devonian red radiolarian chert, Old Tom Formation / Apex Mtn Cx, Keremeos, British Columbia.

Dirk Tempelman-Kluit, former head of GSC Cordilleran division

Tracking chert outcrops along talus slopes! Old Tom Formation, Keremeos, British Columbia.

Bob Foreman on top of his game

Slabs of grey radiolarian chert, Middle Triassic, Bridge River Complex, Gold Bridge, British Columbia.

Tectonic style (metric-size panels, chevron folding) typical of accretionary complexes of the circumpacific regions in general and the Canadian Cordillera in particular.

Varicoloured ribbon chert, Late Permian, Stikine terrane, near Red Mountain, Stewart, British Columbia.

Successions of apparently undisrupted ribbon chert are in fact tectonically duplicated by chevron folding (visible to left)


Grey ribbon chert, Cache Creek complex, Teslin plateau, southern Yukon.

Five to 10 m thick outcrops of Lower Jurassic pelagics and hemipelagics are the youngest strata of the Cache Creek belt.


Cache Creek town site, type-locality, southern British Columbia.

Disrupted outcrops of grey ribbon and limestone olistoliths of the Cache Creek melange along the Trans-Canada highway.

The Oman ophiolite and the Hawasina sedimentary units, Baid, Sultanate of Oman.

Nappes of mafics/ultramafics bodies (dark ruin-like units) are thrust (green units = metamorphic sole) onto red Cretaceous radiolarites of the Hawasina basin.

Red radiolarites from the Gondran cirque, Chenaillet ophiolite near Briançon, France.

This locality shows strongly thinned radiolarian chert beds. Thin sections reveal highly recrystallized and elongated radiolarian shells. This locality has recently been dated as Middle Jurassic (tentatively mid. Bathonian)

Red ribbon chert, blueschists facies, French Range, British Columbia

Locally, Paleozoic and Mesozoic ribbon chert successions from Cordilleran terranes display blueschists metamorphic facies, consistently with low T high P conditions of subduction complexes.

Red siliceous series
of the Jurassic Jedidi
Formation, NW Tunisia.

Olive grove geology... These series are coeval to chert strata of Alpine internal zones s.l

Late Jurassic red cherts from La Désirade Island (Guadeloupe, Lesser Antilles)

Thin radiolarites and jasper are interbedded with pillow basalt flows (Cordey & Cornée 2009, BSGF)