On a wintry day, my 90-year-old father was in the supermarket trying to pay for his groceries. Bundled up against the cold, his gloved hands were having trouble retrieving and counting the exact change.
The transaction evidently took too long for the man behind him in line, who muttered a curse.
Dad stopped counting, turned around, and warned, “Be quiet or I’ll write a check.”
Classification of geological erasIn 1759, Italian geologist Giovanni Arduino (1714-1795) dated a letter to Professor A.Vallisneri the younger, in which Arduino proposed a classification of Earth's surface rocks according to four brackets of successively younger orders: Primary, Secondary, Tertiary and Quaternary. These are the four geological eras used today. The volcanic rocks without fossils which he saw in the Atesine Alps that formed the cores of large mountains he called Primary. Overlying them, the fossil rich rocks of limestone and clay that were found on the prealpine flanks of the mountains he called Secondary. The less consolidated fossil-bearing rocks of the subalpine foothills, he named Tertiary, and the alluvial rock deposits in the plains were the Quaternary.« |
