Category Archives: Weathering history

Cleopatra’s Needle: Egyptian concern about the NYC obelisk

A few days ago Secretary General Zahi Hawass of the Egyptian Supreme Council of Antiquities expressed grave concern about the condition of Cleopatra’s Needle of NYC and even threatened to take the obelisk back to Egypt if care is not … Continue reading

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A Mauerzahn at Grünenfels castle ruin (CH): Surviving 2011?

Switzerland has a wealth of medieval castle ruins. In the Canton of Graübunden they are particularly numerous with, for example, the valley of Vorderrheintal (Surselva) displaying no less than about 50 ruins. Some are almost gone, others are kept in … Continue reading

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Cleopatra’s Needle: Tracing obelisk weathering with old photos

Historic photos are essential for research on monument weathering. With free internet access to archives, such photos are now easier to find than previously. Below, I will show the case of Cleopatra’s Needle, a famous Ancient Egyptian obelisk transferred to … Continue reading

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Stone weathering at the westernmost coast of Norway

As probably one of only very few monuments globally, the ruined Selja medieval abbey off the westernmost coast of Norway is built from a metamorphic olivine stone (dunite) rich in talc. The combination of a hard olivine matrix and soft … Continue reading

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New publications 2009-2010

Though published some months ago, I would like to briefly present four of my most recent publications. Two derives from the EU QuarryScapes project, two from a conference last year in Trondheim about new research at Nidaros Cathedral.

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