Desert varnish (Deserts 🏜️)

Desert varnish or rock varnish is an orange-yellow to black coating found on exposed rock surfaces in arid environments. Desert varnish is approximately one micrometer thick and exhibits nanometer-scale layering. Rock rust and desert patina are other terms which are also used for the condition, but less often.

https://en.wikipedia.org/wiki/Desert_varnish

#DesertVarnish #Rocks #Deserts #Sedimentology #Deposition #HypotheticalLifeForms

First universal common ancestor (Evolutionary biology 🧬)

The first universal common ancestor is a proposed non-cellular entity that was the earliest organism with a genetic code capable of biological translation of RNA molecules into peptides to produce proteins. Its descendents include the last universal com...

https://en.wikipedia.org/wiki/First_universal_common_ancestor

#FirstUniversalCommonAncestor #OriginOfLife #Phylogenetics #GeneticGenealogy #EvolutionaryBiology #HypotheticalLifeForms

Desert varnish (Deserts 🏜️)

Desert varnish or rock varnish is an orange-yellow to black coating found on exposed rock surfaces in arid environments. Desert varnish is approximately one micrometer thick and exhibits nanometer-scale layering. Rock rust and desert patina are other terms which are also used for the condition, but less often.

https://en.wikipedia.org/wiki/Desert_varnish

#DesertVarnish #Rocks #Deserts #Sedimentology #Deposition #HypotheticalLifeForms