Geology Quiz (OQ)

[Cantona]

Spot on Hippotragus

[Hippotragus]

What is the principal rock type in the Eastern part of Kruger NP?

[Cantona]

Rhyolite?

[Hippotragus]

Correct Cantona.

[Tamsy]

In what rock type have the Augrabies falls formed in?

[Dream Weaver]

Gneiss?

[Tamsy]

Correct

[Cantona]

The geology of the mountainous area of Marakele consists of rocks belonging to .................................subgroup?

[phhun]

The Kransberg subgroup.

[Cantona]

Correct phhun

[phhun]

Thanks Cantona.

Driving from Phalaborwa to Letaba you soon pass 3 koppies, the most well known being Masorini. What rock type are they and how do they form?

[Hippotragus]

They are granite and gneiss.

Granite is an igneous rock formed from melted rock. Gneiss is formed from metamorphised granite.

[phhun]

Hi Hippotragus
Close but not what I'm looking for exactly.
Granite and gneiss are general terms for plutonic igneous and metamorphosed granitic rocks. The hills are of a rock that is rather rare in the world and how do the hills form?

[phhun]

Back from the Kruger! The rock is syenite, formed deep in the crust but at lower temperatures than granite formations. This leads to a deficiency of quartz compared to granite. The syenite formed bulbous structures in the crust like laccoliths and have appeared through differential erosion.