Bartolomé is middle aged in terms of the Galápagos with 2-3 million
years under its belt. This small island was formed when the Earth's
crust moved over the Galapágos hotspot. Well before daybreak we headed
there on another Jaws-style vessel, although this time with decidedly
less powerful engines. After two hours on board the island appeared on
the horizon. I've never seen an island that looks more like a volcano
that this. The landscape is totally rust coloured and almost completely
barren. The only plants that live here are hardy xerophytes, like the
desert cactus that needs no rainfall whatsoever and completely recycles
itself, thereby needing almost no mineral input. The only animals are
crabs and the odd lizard. A big mammal like me whose body is 70% water
would last a couple of days, especially given the fact I'm the sweatiest
person within a thousand mile radius.
This volcanic gem isn't actually one volcano. It is comprised of many
parasitic secondary cones which are part of two overlapping volcanoes
which together form the nearby Santiago island. The evidence of
volcanic activity is very clear and omnipresent. There are two
main types of rock formation: the smooth lava flows with tunnels; and
the far more jagged deposits known as 'Ah Ah', so called as people make
this sound as they walk on it with bare feet. Despite having had at
least two million years of evolution, this landscape showed little
evidence of succession. It lies naked in stark contrast to the
rainforest in which plants and animals can colonise denuded areas in a
couple of decades. Nearby, on Santiago, a lava field can be seen which
was the result of an eruption in the late 1800s. This black, bleak
expanse of rock was bereft of any vegetation. It made me appreciate the
time needed for the arrival of seeds by wind, water or winged-deposits
from above. Add to this the painfully slow process of soil formation and the time needed for Darwin's theories to play out can be appreciated.
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