"Lunar landscape, strange relief from jurassic era" Tangorombohitr' Isalo Things to Do Tip by Norali

Tangorombohitr' Isalo Things to Do: 16 reviews and 26 photos

  La fenÍtre, amongst weird shapes there..
by Norali
 
 

The park has a ruin-shaped relief (cf. intro pic), vast grassy plains. This seemingly dry area contains several rivulets and springs in the narrow canyons. Worth noticing, it is located in a hugely eroded sandstone massif. Yes, wind and rain combined their actions to erode and grant rocks with strange shapes.

As for Isalo massif itself, it results from a sandstone formation in jurassic era, more specifically during marine invasions and regressions. Then, two sorts of sandstone, of marine origin and of land origin.

When relief reached 1000 m height (altitude), it has flattened at this level. But an erosion had shaped this landscape of canyons, talus and what we know now as Isalo plateau.

Southern and Eastern areas of Isalo massif are made up by sandstone layers, with aggregates of different dimensions and resistances (strengths). Following an erosion, the massif had a new ruin-shaped relief whose altitude ranges from 820m to 1240m.

To be clear, the layers of different strengths were equally attacked by erosion but, say, reacted differently to erosion. The most resistant layers were less eroded and had kept the altitude of above 1000m. Some layers were less resistant to wind and rain, they are of lesser altitude.

Others were completely eroded and gave birth to deep canyons such as Lemurs canyon and Rats canyon.

All the contrasts on this site are simply amazing, you have to see it: rocks here, greenery there, canyons here, ricefields there, dry red soil here, rivulets and cascades there...

Directions: isalo national park in Isalo Massif

Review Helpfulness: 4.5 out of 5 stars

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  • Updated Jul 30, 2004
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Norali

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