... observations on cherts ...

This column is dedicated to observations on cherts, particularly on those with fossils. It is meant to show the broad diversity of types, the richness of detail in their fossil content, or the sheer beauty of their cut and polished faces. Devoting some of one's spare time to cherts can be emotionally rewarding since there are a lot of enigmatic features awaiting explanation, and there are fair chances for anyone to find out something remarkable or even unique.

The contributions could be readily understandable concise versions of published or unpublished papers, ideas concerning observations, or plain reports on finds which might be of interest. Professionals as well as non-professionals are invited to contribute. Please contact me.

miscellaneous
silicification
Permian cherts
Rhynie chert (Devonian)
marine cherts

miscellaneous

Definitions
text & photographs: R.KRETZSCHMAR/Chemnitz
Sorry, English version not yet available. For German version click here!

Seen through
text & photographs: R.KRETZSCHMAR/Chemnitz, idea: G.MUELLER/Dresden

Exhibitions
text & photograph: R.KRETZSCHMAR/Chemnitz, photographs: MfNC, Museum Nova Paka

observations on silicification

Horizontal layers and plates in chert
text & photograph: H.-J. WEISS/Rabenau, photographs: J. GARDAVSKY

observations on Permian cherts

Bornheim roots
text & photographs: R.KRETZSCHMAR/Chemnitz

News from Schallodenbach
text & photographs: R.KRETZSCHMAR/Chemnitz

A chert from Grosssedlitz
text & photographs: K.HOFFMANN/Dresden
Sorry, English version not yet available. For German version click here!

Hairs on Scolecopteris sporangia
text & photographs: H.-J. WEISS/Rabenau

A peculiar habitat
text & photographs: R.KRETZSCHMAR/Chemnitz

A "maggot stone" from Nobitz
text & photographs: R.KRETZSCHMAR/Chemnitz

Pecopteris within the Windberg chert
text & photographs: G.MUELLER/Dresden

Observations concerning HEINRICH COTTA's collection
photographs: H.SAHM/Dresden, text & photographs: R.KRETZSCHMAR/Chemnitz

Veining type - a distinct feature of Psaronius tree fern pinnules
text: H.-J. WEISS/Rabenau, photographs: M. BARTHEL/Berlin, H. SAHM/Dresden

Conspicuous in the chert - synangia of Scolecopteris
text: H.-J. WEISS/Rabenau, photographs: H. SAHM/Dresden

The special maggot stone - a picture show
photographs: W.SCHWARZ/Dresden, R.RÖSSLER/Chemnitz, V.WESTPHAL/Radebeul,
text & photographs: R.KRETZSCHMAR/Chemnitz

Lycopsids from the Rotliegend of North-West Saxony
photographs: H.SAHM/Dresden, text & photographs: R.KRETZSCHMAR/Chemnitz

GALTIER's Pitus in the Rotliegend of Saxony?
photographs: H.SAHM/Dresden, text & photographs: R.KRETZSCHMAR/Chemnitz

observations on Rhynie chert (Devonian)

Horneophyton sporangia as odd-shaped bags
text, photographs & drawings: H.-J. WEISS/Rabenau

A peculiar way of creeping - Aglaophyton reconsidered
text, photographs & drawing: H.-J. WEISS/Rabenau

Ebullitiocaris - a slothful little creature that comes in flocks
text & photographs: H.-J. WEISS/Rabenau

Is there more than one charophyte alga in the Rhynie chert?
text, photograph & drawings: H.-J. WEISS/Rabenau, photographs: H. SAHM/Dresden

Size matters - Aglaophyton sporangia bigger than expected
text: H.-J. WEISS/Rabenau, photographs: H. SAHM/Dresden

Aglaophyton epidermis outlined
text & photographs: H.-J. WEISS/Rabenau

The work of spore eaters
text & photographs: H.-J. WEISS/Rabenau

Twisted evidence
text: H.-J. WEISS/Rabenau, photographs: H. SAHM/Dresden

A pattern of questionable origin
text: H.-J. WEISS/Rabenau, photographs: H. SAHM/Dresden

Ventarura taking shape
text & drawings: H.-J. WEISS/Rabenau, photographs: H. SAHM/Dresden

A rare aspect of Aglaophyton
text & photograph: H.-J. WEISS/Rabenau

Thoughts on an enigmatic plant
text: H.-J. WEISS/Rabenau, photographs: H. SAHM/Dresden

observations on marine cherts

Cherts from the Middle Triassic
text & photographs: H.HUHLE/Roeblingen

"A mere silicious rock"
text & photographs: R.KRETZSCHMAR/Chemnitz