Joshua Trimmer was an English

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 geologist

Geologist

A geologist is a scientist who studies the solid and liquid matter that constitutes the Earth as well as the processes and history that has shaped it. Geologists usually engage in studying geology. Geologists, studying more of an applied science than a theoretical one, must approach Geology using...

 born at North Cray

North Cray

North Cray is a place in the London Borough of Bexley, southeast London, England, east southeast of Charing Cross. It lies on the River Cray and is in the Cray Meadows electoral ward which also includes Foots Cray...

 in Kent

Kent

Kent is a county in southeast England, and is one of the home counties. It borders East Sussex, Surrey and Greater London and has a defined boundary with Essex in the middle of the Thames Estuary. The ceremonial county boundaries of Kent include the shire county of Kent and the unitary borough of...

. He was the son of Joshua Kirby Trimmer of Brentford

Brentford

Brentford is a suburban town in west London, England, and part of the London Borough of Hounslow. It is located at the confluence of the River Thames and the River Brent, west-southwest of Charing Cross. Its former ceremonial county was Middlesex.-Toponymy:...

, and grandson of Sarah Trimmer

Sarah Trimmer

Sarah Trimmer was a noted writer and critic of British children's literature in the eighteenth century...

 (1741-1810), author of the Story of the Robins (1786).

At the age of nineteen he was sent to North Wales

North Wales

North Wales is the northernmost unofficial region of Wales. It is bordered to the south by the counties of Ceredigion and Powys in Mid Wales and to the east by the counties of Shropshire in the West Midlands and Cheshire in North West England...

 to manage a copper

Copper

Copper is a chemical element with the symbol Cu and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; an exposed surface has a reddish-orange tarnish...

 mine for his father; subsequently he was placed in charge of a farm in Middlesex

Middlesex

Middlesex is one of the historic counties of England and the second smallest by area. The low-lying county contained the wealthy and politically independent City of London on its southern boundary and was dominated by it from a very early time...

, where he acquired a knowledge of and an interest in soil

Soil

Soil is a natural body consisting of layers of mineral constituents of variable thicknesses, which differ from the parent materials in their morphological, physical, chemical, and mineralogical characteristics...

s; in 1825 he became manager (for his father) of slate

Slate

Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. The result is a foliated rock in which the foliation may not correspond to the original sedimentary layering...

 quarries near Bangor

Bangor, Wales

Bangor is a city in Gwynedd, north west Wales, and one of the smallest cities in Britain. It is a university city with a population of 13,725 at the 2001 census, not including around 10,000 students at Bangor University. Including nearby Menai Bridge on Anglesey, which does not however form part of...

 and Carnarvon

Carnarvon

Carnarvon and Caernarvon are older forms of the name of the town in North Wales currently known as Caernarfon. The older names, in place for centuries, were anglicised phonetic spellings; since the 1970s the Welsh spelling has been generally adopted...

, and in this district he remained for many years. He discovered the marine shells in the drift of Moel Tryfaen. During the years 1850 to 1854 he was engaged on the Geological Survey

Geological survey

The term geological survey can be used to describe both the conduct of a survey for geological purposes and an institution holding geological information....

, and surveyed parts of the New Forest in Hampshire

Hampshire

Hampshire is a county on the southern coast of England in the United Kingdom. The county town of Hampshire is Winchester, a historic cathedral city that was once the capital of England. Hampshire is notable for housing the original birthplaces of the Royal Navy, British Army, and Royal Air Force...

. He died in London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

.

He published memoirs on the Origin of the Soils which cover the Chalk of Kent; On the Geology of Norfolk, as Illustrating the Laws of the Distribution of Soils (1847); and Proposals for a Geological Survey, specially directed to Agricultural Objects (1850); in this respect he was a pioneer in agricultural

Agriculture

Agriculture is the cultivation of animals, plants, fungi and other life forms for food, fiber, and other products used to sustain life. Agriculture was the key implement in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that nurtured the...

 geology

Geology

Geology is the science comprising the study of solid Earth, the rocks of which it is composed, and the processes by which it evolves. Geology gives insight into the history of the Earth, as it provides the primary evidence for plate tectonics, the evolutionary history of life, and past climates...

. He was also the author of another useful work Practical Geology and Mineralogy (1841).