Trilobite Riches

12 Jan 2019

At https://phys.org/print466333233.html ... trilobite fossils are common to all parts of the world, northern and southern hemispheres. They dominated the early seas.

   ...   Trilobites were arthropods which became extinct 252 million years ago at the End of Permian mass extinction event. They thrived in the Cambrian seas - living on the sea bed, or close to it - for an estimated 270 million years. However, the evolution of these creatures is poorly understood. Scientists know a lot about the ones that died in the Permian but little about the early forms of trilobite - and in between. This may be as a result that it requires catastrophic events, in this instance of the marine kind, in order to preserve specimens. However, a team of researchers now claim to have partly rectified the situation - and have looked at a particular bunch of fossils.

Anatomically Trilobites look like the modern cockroach - yet they lived in the sea. The closest living relative is the shrimp - in all its many forms. Scorpions and spiders are also loosely said to have some similarities - not too obvious when looking at the image above. They look like large wood lice.

At https://phys.org/print466324522.html ... Easter Island again. Apparently, researchers have noticed something important about the situation of the platforms on which the heads were placed. They appear to be unioversally sited close to freshwater sources. More interestingly, other locations suitable to position the platforms do not display any evidence of fresh water - which seems to confirm the importance of this valuable resource on an island environment. Was fresh drinking water in short supply once the population of Easter Island began to rise after several generations, and were the gods in their hats, the so called Mau, somehow entreated to keep the water flowing.