Geologists hold that all these formed a single range prior to the breakup of the ancient supercontinent Pangaea.

* Dennis Curry, geologist, President from 1963-5 of the Geologists ' Association, grandson of Henry Curry ( founder of Currys ), and Chairman of his family's electrical company from 1968 until July 1984, prior to the firm's takeover

Geologists use a variety of methods to give both relative and absolute dates to geological events.

Geologists use both large fossils ( called macrofossils ) and microscopic fossils ( called microfossils ) for this process, known as biostratigraphy.

Geologists know the exact chemical composition of this tephra ( which they call Mazama Ash ) and both geologists and archeologists use the distinctive layer it formed in the specific techniques of relative dating called tephrochronology.

Geologists of the early 20th century presumed that a large trough, a so-called geosyncline, had existed between Scotland and England in the early Paleozoic, keeping both sides separated.

Geologists generally refer to these incipient plates as the Nubian Plate and the Somali Plate.

Geologists have noted the chemical and geological content of these three mountains to be much different than that of the Cascade Range, simply because they are not volcanic in origin, while the entire Cascade Range is postulated to have formed from volcanic action.

Geologists call these gorges and hollows " the Syracuse channels.

Geologists estimate the age of these rocks as 290 to 296 million years ; they were lifted and tilted into their present orientation between 35 and 80 million years ago, during the Laramide Orogeny.

Geologists were also concerned that the St. Helens eruption was a sign that long-dormant Cascade volcanoes might become active once more, as in the period from 1800 to 1857 when a total of eight erupted.

Geologists like Suess have found fossils of ocean creatures in rocks in the Himalayas, indicating that those rocks were once underwater, before the Indian continental shelf began pushing upward as it smashed into Cimmeria.

Geologists were not then able to date sediments accurately enough to determine if glaciation was synchronous between the hemispheres, though the limited evidence more pointed towards synchronicity than not.

Geologists were recruited to determine whether underground swales were responsible for carrying the chemicals to the surrounding residential areas.

The first such laminations were found in a rock called “ The Dells .” Geologists would say that the cross-stratification showed festoon geometry from transport in subaqueous ripples.

The first such laminations were found in a rock called “ The Dells .” Geologists would say that the cross-stratification showed festoon geometry from transport in subaqueous ripples.

Geologists and cartographers explored what were the unmarked regions on European maps, identifying mountains and rivers, and demarcating boundaries.

Geologists began to define the soil of the place where the metallurgical works were to be built.

Geologists were hired to research the structure as well as city planners were hired for designing however there were no investors at the time and therefore the project was subsequently abandoned.

The Society of Economic Geologists ( SEG ) originated from a 1919 gathering of a group of Geological Society of America ( GSA ) members who were especially interested in economic geology.

Training programmes encompassing Orientation Course for Geologists, Basic Courses, Refresher Courses, workshops, Advanced Course, INDIGEO Programmes, and ISRO-and DST-sponsored programmes were successfully completed.

In 1842, he and his brother William, who was similarly occupied with a geological survey in Virginia ( his reports were published in 1838 and 1841, and he wrote also on the connection between thermal springs and anticlinal axes and faults ), brought before the Association of American Geologists and Naturalists their conclusions on the physical structure of the Appalachian chain, and on the elevation of great mountain chains.

Geologists believe that the Beartooths were at one time at least in altitude, but subsequent erosion for tens of millions of years has reduced them to an average of for the higher peaks.

Geologists were first attracted to this locality in the late 1820s with Abraham Gesner, Richard Brown, Thomas Jackson and Francis Alger all making important observations.

Geologists Sam Bonis and T. Waltham argue that the recurring piping features in Guatemala are caused by sewer leaks eroding soft volcanic deposits underlying Guatemala City.

Geologists S. Day and S. Ward consider that a megatsunami could be generated during a future eruption involving the Cumbre Vieja on the volcanic ocean island of La Palma, in the Canary Islands, Spain.

Geologists call such a lack of volcanic activity near a subduction zone a magmatic null.

Geologists believe that Viti Levu has been submerged a number of times, and has been covered by lava and other volcanic materials.

Geologists have tried to use hotspot volcanic chains to track the movement of the Earth's tectonic plates.

Geologists believe that it preserves the remains of an immense volcanic eruption that shook the region some 27 million years ago.

Geologists say that eruptive activity deposited a layer of volcanic rock some 6, 000 feet thick, creating a high and fertile plateau.

Geologists have proposed several theories about their origin.

Geologists use the term " marble " to refer to metamorphosed limestone ; however stonemasons use the term more broadly to encompass unmetamorphosed limestone.

No scientific body of national or international standing has maintained a dissenting opinion ; the last was the American Association of Petroleum Geologists, which in 2007 updated its 1999 statement rejecting the likelihood of human influence on recent climate with its current non-committal position.

Rogers was chairman of the Association of American Geologists and Naturalists ( AAGN ; organized 1840 ) in 1845 and again in 1847, and contributed important memoirs to its Transactions, including observations on the temperature of coal mines in eastern Virginia.

APEGGA ( Association of Professional Engineers, Geologists, and Geophysicists of Alberta ); Association of Exploration Geochemists ; Fellow, Geological Association of Canada and former member, Association of Alberta Petroleum Geologists.

Geologists do not know what happened to the eroded sediment that must have overlain the complex, but they do know that regional uplift was responsible ; the area was originally below the surface of a shallow sea.

Sevon, W. D., and Fleeger, G., 1999, Ringing Rocks Block Field ; Guidebook, 64th Annual Field Conference of Pennsylvania Geologists, Allentown, Pennsylvania, pp. 112 – 121

Geologists feared, however, that samples obtained from the crater might have been contaminated by the Imbrium impact, thus preventing Apollo 16 from obtaining samples of pre-Imbrium material.

Geologists have estimated that a much larger deposit exists deeper and possibly off shore from the peninsula in the 400-500 billion barrel range, however exploration drilling has not yet confirmed this theory.

Geologists also obtain data through stratigraphy, boreholes, core samples, and ice cores.

Geologists and engineers drill core samples and conduct surface surveys searching for specific compounds and ores.