When I wrote the post on Lake Magadi , I forgot to include a very interesting place located on route to the lake: Olorgesailie, located about 60km southwest of Nairobi.
Being almost at the bottom of the rift valley it was hot all year round and often ignored by passers-by heading for Magadi and beyond. We did stop there a few times and even stayed a couple of weekends while I was writing my PhD thesis. as it was a very quiet place.
The site is in a lake basin that existed there probably between 200,000 and 100,000 years ago (mid Pleistocene). The lake was fed by the long gone Ol Keju Nyiro River, displaced by the then common and dramatic earth movements. While the lake existed it attracted game and hunters and then bones and tools accumulated, got buried and remained there for eons. Somehow they eventually re-surfaced and were found, first by the “discoverer” of the rift valley, J.W. Gregory, in 1919 and later by Louis and Mary Leakey.
The Leakeys, as they are commonly known, started working in the area in 1942 and unearthed crucial evidence on the activities and life of early prehistoric peoples of the Hand axe culture. Because of the fossil wealth it contained, it was declared a small National Monument of about 20 hectares in 1947 to preserve the finds under the care of the National Museum of Kenya.
We had the chance of listening to Mary Leakey talking about her work at Oligosailie and Olduvai. Louis had already passed away by then but we also attending lectures by their son Richard also exposing his finds and ideas about the evolution of man in Africa to which the findings at Oligosailie are very relevant.
Both were lecturers at the Know Kenya Course (now re-named Know Kenya More) that the Kenya Museum Society started running in 1971 and that were going full swing in the 80’s. These series of lectures were a great way for new arrivals to get familiar with the country while getting funds to support projects of this institution in Kenya.
During Mary’s lecture we learnt that at both Olduvai and Olorgesalie heavy accumulation of volcanic ash preserved the famous footsteps in the former and the fossils in the latter. The main producer of ash at Olorgesailie was the now extinct volcano that gives the site its name that with its 1760m dominates the area.
The most important fossils in Olorgesalie were human-made tools and their abnormal accumulation in the area is evidence of early man had their camps. I recall our guide during our tour of the site pointing at tools and the flakes that resulted from their making that truly littered the ground and I seem to recall that Louis Leakey used to make stone tools to practically demonstrate his conclusions at international meetings!
Apart from stones Olorgesalie also had some living attractions. One of the “specials” were the very tame Grey-headed social weavers (Pseudonigrita arnaudi) that nested in the surrounding trees and would come to feed from your hand. It was also one of the few places in Kenya to see Desert roses (Adenium obesum) around the bungalows.
Mabel and weavers.
Desert roses (pink) and other Olorgesailie flowers.
As the area was extremely hot, we walked during the early mornings and evenings and these did not include climbing Mt. Olorgesailie as we are not climbers but to follow the several paths used by the Maasai in the area as there were still a sizeable population of wild herbivores as well as lots of interesting birds.
Apart from the ubiquitous whistling thorns , the area is full of another thorny tree known as “wait a bit” , a name that describes perfectly its hooked thorns’ ability of stopping you in your tracks. Damage control in these cases indicated reversing to unhook yourself if you could. However, when you were caught jumping or going down a ravine unable to stop the damage to your skin could be rather painful and bloody. Most of the time I ended our walks not only dusty but bleeding from arms and legs. To add insult to my injuries my wife -rather miraculously- ended up dustless and unscathed, a trait she maintains up to date!
It was not rare to find Maasai herdsmen walking their cattle to the scarce watering points located in the area. They would follow the dry riverbeds that crisscrossed the area to find water. It was in one of these dry rivers while driving to get to Olorgesailie that we met a Maasai herdsman at really close quarters.
I took a picture of a herd of cattle drinking by the road, something that their owner did not appreciate and, before I knew it, he was inside the back of our kombi where he joined a very close lady friend of ours that happened to be traveling with us at the time. The man was upset and started arguing with me about the picture leaning forward and trying -unsuccessfully- to grab my camera while I was trying to calm him down and explain him that I was taking a picture of the scene and not of himself!
Unfortunately, during the rather protracted exchange he placed himself in front of our friend who, for a while, had an unobstructed view of his rear end until, when more relaxed, even sat on her lap! Eventually the message went through and the Maasai departed to join his animals, I kept my picture and our friend the “views” and the achievement of having a Maasai on her lap! The incident has remained one of our indelible memories of the times we spent together in Kenya.
At the same spot, a couple of years later we had a different encounter. A leopard had just drank at the same waterhole and it was returning to its territory and decided to cross the road. Totally unconcerned by our presence, after staring at us at leisure, proceeded to climb the rocks on the other side of the road before I could even touch my camera! It was one of the very few encounters with leopards we had in Kenya.
 See: https://bushsnob.com/2016/05/07/pink-gem-but-smelly/
 These plants that I knew as Acacia drepanolabium (now Vachellia drepanolobium) produce swollen hollow thorns inside which several symbiotic species of ants live. The wind blowing over the holed bulbous thorns it creates a clear whistling noise.
 Senegalia brevispica