Experiments on stratification discussed here have revealed
the mechanical nature of lamination as well as the role of turbulent
current as agent of stratification. They challenge Steno’s principle that
superposed strata are successive sedimentary layers. They show that relative
chronology should not be referred to as “stages” but as “sequences” of series.
The rock formation studied by Lalomov shows that the duration
of sedimentation could be considerably shorter than indicated by the Geological
Time Scale. The latter scale corresponds to large marine transgressions and
regressions that can result from the shift of polar axis following such major
orogeneses as the Caledonian, Hercynian and Alpine.
generalize a result on bifurcation from infinity of high order ordinary
differential equations with multi-point boundary conditions. Our abstract
setting represents a variant of Nonlinear Krein-Ruthman theorems. Furthermore,
an analysis of this abstract setting raises an open question motivated by some
misunderstanding and inconclusive proofs about the simplicity of principal
eigenvalues in some articles in the literature.