GlossaryPrint

Death rate

number of deaths in a given period, usually one year, divided by the average population of this period. The rate is determined by “number of deaths / resident population * 1000” and is expressed in terms of “per 1000 of population” (‰).

Denomination of Controlled Origin

defines geographical areas of production of specific agricultural products (such as wine or olive oil), and enforces rules that ensure quality standards in each region.

 

Denomination of Protected Origin

consists of the use of the name of a region, of a specific place or, in exceptional cases, of a country, which serves to designate an agricultural product or a nourishing type original from this region, from this specific place or from this country and whose quality or characteristics are due essentially or exclusively to the geographical environment, including the natural and human factors, and whose production, transformation and preparation take place in the delimited geographical area.

Density of the built environment

the calculation formula is “buildings/area” and the measuring unit is “number/square kilometre (N.o/ km²)”.

Denticulate

stone tool with a characteristic serrated edge obtained by successive retouch.

 

Devonian (416-359 Ma)

period of the Paleozoic Era characterized by the appearance of the first amphibians.

Dimetrodon

kind of predator belonging to a group of animal’s in-between mammals and reptiles, which flourished during the  Permian period, living between 280265 million years ago. The Dimetrodon was not a dinosaur. Fossils of Dimetrodons were found in North America and Europe, as well as an important discovery of tracks in southern New Mexico.

Dinosaur

meaning 'terrible lizard'. The term was proposed by the Englishman Richard Owen at the end of the 19th century to describe a group large of animal fossils with reptilian characteristics that existed during the Mesozoic Era (251-65 Ma).

Divergence zone

divergence zone in the lithospheric plates, also known as rift.

Dyke/Sill

magmatic material that has an elongated form, filling out fractures or discontinuity planes between rock layers. It has variable nature, thickness and dip.

 

Dyke/Sill rocks

formed in areas of existing fractures crossing other rocks. Of magmatic origin, this kind of rock may vary in thickness from a few centimeters to several meters, with lengths that may reach several kilometers. In the Côa Valley, sill quartz was used during all the Prehistory for tool production.

 

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