Come
celebrate the birth of Nicolas Steno (1/11/1638 – 11/25/1686)
who was a Danish pioneer in geology.
Steno, in his Dissertationis prodromus of 1669 is credited with four of the defining
principles of the science of stratigraphy:
1) the law
of superposition: "...at the time when
any given stratum was being formed, all the matter resting upon it
was fluid, and, therefore, at the time when the lower stratum was
being formed, none of the upper strata existed";
2) the
principle of original horizontality:
"Strata either perpendicular to the horizon or inclined to the
horizon were at one time parallel to the horizon";
3) the
principle of lateral continuity:
"Material forming any stratum were
continuous over the surface of the Earth unless some other solid
bodies stood in the way";
4) the
principle of cross-cutting
relationships: "If a body or discontinuity cuts across a
stratum, it must have formed after that stratum."
Another principle, known simply
as Steno's
law, states that the angles between
corresponding faces on crystals are the same for all specimens of
the same mineral, a fundamental breakthrough that formed the basis
of all subsequent inquiries into crystal
structure.
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No Frills Grill & Sports Bar
Arlington location on Little Road, 5:30-8:00 p.m.
Join fellow cachers in SouthWest
Arlington for a "No Frills" event.
They have a good selection of
food and drinks for those interested. The place is
kid-friendly.
* This event is being hosted
SWAG (SouthWest Arlington Geocachers), a group of cachers that meet
every Wednesday here, so even if there's not an event, we are
probably there. Come visit! *