He
went from Prussia to Russia as he studied rocks and minerals.
Born
on this date in 1719, Lehmann was a German geologist. He studied
mining practices in the German states of Saxony and Prussia, and he
eventually became a professor of chemistry in Russia, where he also
directed the imperial museum.
But
Lehmann is best known as one of the founders of stratigraphy.
Many
rocks are formed in shallow seas and lakes, as sand and clay
particles, tiny rocks, bones and shells of dead creatures, and other
sediments sink to the bottom of still or slow-moving water. Over the
years, these sediments are crushed together by the weight of newer
particles and, of course, the water itself—crushed together so hard
that the sediments form a rock.
Examples
of such sedimentary rocks include:
sandstone,
limestone,
and
conglomerate.
Lehmann
and other pioneers of stratigraphy were able to study and describe
various layers of rock, which can give rock a striped look.
Sedimentary rocks have since become very important in determining
time scales and figuring out what was happening on the earth, both
with landforms and lifeforms, in the far, far past.
 |
| Striped rocks=beautiful rocks. The Grand Canyon is made from eroded sedimentary rock. |
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