GlossaryPrint

Tardiglaciar

name given to the closing part (15,000-10,000 years before the present) of the last Ice Age.

Technology-complex

concept that seeks to illustrate the variability of the basic technology likely to be represented, in time and space, during a supposedly cohesive cultural facies (industry).

Tectonic activity

set of geological processes resulting from the internal dynamics of the Earth, more frequent in the boundaries of tectonic plates, where it materializes in seismic and volcanic activity, leading to the formation of mountain ranges and volcanoes.

 

Tectonic plate or lithospheric plate

portion of the lithosphere of variable size (from hundreds to thousands of km in length) and thickness between 10 and 200 km. It can hold both continental masses and oceans, like the Euro-Asian plate, or be exclusively oceanic, like the Nazca plate. 52 tectonic plates are recognized and 14 are considered as the main ones. These plates are not static, moving as if they were on a conveyor belt - the asthenosphere. Their edges or boundaries (margins) may be divergent, convergent or passive, depending if the plate’s retreat, approach or maintain position. These plates are created in divergence zones or rift zones, and are destroyed in subduction zones. The highest seismic and volcanic activity is registered in the boundary of the plates.

 

Tectonics

geological process that implies movement of rock masses with modification and reorganisation of the Earth’s crust in the affected area. The rock masses move by the action of tension fields that can culminate in an episode of plates collision and formation of a mountain chain or, on the contrary, in a distension episode that leads to the origin of an ocean.

Temporary crops

crops whose vegetative cycle does not exceed one year and also those with reseeding intervals that do not exceed 5 years.

Tethys

ancient Mesozoic sea that resulted from the closing of the Paleotethys Ocean, when Pangea formed. As the African and Euro-Asian continents came closer, this sea began reducing its size, originating present-day Mediterranean, meaning 'sea in the middle of the land'.

Tetrapod

extinct vertebrate that appeared in the Devonian (416-359 Ma). It had leg-like appendages that allowed locomotion from aquatic to terrestrial environments. It was similar to crocodiles nowadays.

Texture

refers to the shape, size, and arrangement of the minerals or constituent elements of a rock. The texture of a rock sample can be assessed macroscopically or by microscopic study in thin slice.

 

Tool

any object with a morphology adapted or modified by a set of attributes imposed by man.

 

Tourism

set of activities pursued by visitors when traveling or staying in distinct locations from their usual environment, for a consecutive period of time of less than 12 months, with leisure, business or other purposes that do not imply carrying out any paid activity in the visited place.

Tourist

visitor who stays at least one night in a collective or private accommodation in a visited place.

Triassic (251-200 Ma)

this period of the Mesozoic Era, controlled by the super-continent Pangea, bathed by the Panthalassic Ocean, is marked by the appearance of the first dinosaurs, fish with a bony skeleton and ammonites. Pangea began breakingup at the end of this period, with the individualisation of Laurasia and Gondwana, and the separation of several tectonic plates.

Trilobites

ancient marine arthropods (such as insects, spiders and crabs) that lived exclusively in the Paleozoic (542-251 Ma) seas and are known only in the fossil record. Most lived in shallow environments, dragging along ocean floors. They are attested in the Côa region solely by the traces left in the sediments (Bilobites).

 

Type

concept that underlies a homogeneous population of artifacts with a coinciding group of systematically recurring attributes in a given polythetic set (it is an ideal “object”, equipped with a series of wholly assumed attributes).

Typology

field of archaeological investigation that aims to recognise, define and classify the different assortment of objects existing in an archaeological find.

Tyrannossaurus rex

meaning 'king of the tyrant reptiles'. It was a carnivorous bipedal dinosaur that lived at the end of the Cretaceous (99-65 Ma) and was very common in the land known today as North America. Of gigantic dimensions, it was approximately 5 m high, 13 m long and weighed 6 tons. It could reach 48-65 km/h when running.

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