HOME
DECORATION
PORTRAITURE
MULTIMEDIA
ARTIST
CONTACT
ART SHOP


  HISTORY TIMELINE
PRECAMBRIAN
CAMBRIAN
ORDOVICIAN
SILURIAN
DEVONIAN
CARBONIFEROUS
PERMIAN
TRIASSIC
JURASSIC
CRETACEOUS
PALEOGENE
NEOGENE

  DECORATION
The Art of Faux Finish
Stair Faux Finish & Painting Decoration
Craqueleur - Faux Finish Decor Sample
Painting Walls, Murals & Ceiling
Balcony Border Painting
Column Painting
Fish and Meat Painting - Hand Painted Signs
Wall Painting, Floor Sanding & Varnishing

  MURAL PAINTING
Mural Painting Gallery
Venice Mural Painting
Paris Street Scene Mural Painting
Neoclassical Mural Painting
Mediterranean Mural Painting
Italian Restaurant Mediterranean Mural Painting
Indian Restaurant Mural Painting
Landscape Mural Painting
Autumn Landscape Mural Painting
Trompe l'Oeil Ceiling Mural Painting
Pyramid & Sphinx - Egyptian Trompe l'Oeil Mural Painting
Murale Peinture, Plafond, Meubles, Décoration : Montréal Québec
Renaissance Ceiling Mural Painting
Cinema Ceiling Mural Airbrush Painting
Clouds and Birds Ceiling Painting
Dome and Pergola Clouds Ceiling Painting
Sky and Clouds Ceiling Mural Painting
Aquarium Mural Painting
Swimming Pool Mural Painting
Swimming Pool Mural Painting - Trompe l'Oeil
Swimming Pool - Spa
Salon des Ongles & Spa - Seascape Mural Painting
Spa - Exotic Seascape Mural Painting
Spa Waterfalls and Seascape Mural Painting
Pool and Billiard Mural Painting
Scenic Backdrops Airbrush Painting
Contemporary Murals
Graphic Arts and Calligraphy Mural Painting
Mural History Timeline
Mural Painting Process
Mural Painting Techniques
Painting Terms
GET YOUR MURAL PAINTING QUOTATION

  CHILDREN MURALS
Hockey and Celebrity Mural Painting
Kids Jungle Animals Nursery Murals
Children Murals - Animal Painting
Children Mural - Princesses
Four Seasons-Spring, Summer, Autumn, Winter-Mural Painting
SAILOR's ROOM - Interior Design & Mural Painting Decoration
Boys Room Murals
Nursery Room Modern Design

  PORTRAIT PAINTING
Portraiture
Portrait Painting & Pricing
Oil Portrait Process
Portrait of Arabian Horse & Beautiful Rider
Profession Oil Portrait - Engineer
Mother and Baby - Oil Portrait Painting
Hockey Boy Oil Portrait
Grandma and Grand Daughter Oil Portrait
Double Portrait - Oil Painting Process
Grisaille - Oil Portrait
Charcoal Portrait
Oil Portrait Painting - Baby, Sky, Sea and Sand
Wedding Oil Portrait Painting

Aunt"s Oil Portrait


  PAINTING GALLERIES
Animal & Wildlife Painting
Horse Painting
Dog Painting
Cat Painting
Bird Painting
Fish & Marine Painting
Dragon Painting
Figure Painting
Flower & Insects Painting
Landscape Painting
Illustrations


 

Devonian time

The period is named after Devon, a county in southwestern England, where Devonian outcrops are common. While the rock beds that define the start and end of the period are well identified, the exact dates are uncertain. According to the International Commission on Stratigraphy (Ogg, 2004), the Devonian extends from the end of the Silurian Period 416.0 ± 2.8 million years ago (Mya), to the beginning of the Carboniferous Period 359.2 ± 2.5 Mya (in North America, the beginning of the Mississippian subperiod of the Carboniferous) (ICS 2004).

Well into the 20th century, the Devonian was often quoted as being "the age of fishes", referring to the great diversification of various piscine groups in the period. While the development of fishes is of great importance from an anthropocentric point of view (inasmuch as they are our vertebrate relatives), the name is now avoided, as fishes were but one of several important groups to see extensive development on the Devonian. The name is frequently found in older (and a few newer) works. In nineteenth-century texts the Devonian has been called the "Old Red Age", after the red and brown terrestrial deposits known in the United Kingdom as the Old Red Sandstone in which early fossil discoveries were found.

The Devonian has also erroneously been characterized as a "greenhouse age", due to sampling bias: most of the early Devonian-age discoveries came from the strata of western Europe and eastern North America, which at the time straddled the Equator as part of the supercontinent of Euramerica where fossil signatures of widespread reefs indicate tropical climates that were warm and moderately humid but in fact the climate in the Devonian differed greatly between epochs and geographic regions. For example, during the Early Devonian, arid conditions were prevalent through much of the world including Siberia, Australia, North America, and China, but Africa and South America had a warm temperate climate. In the Late Devonian, by contrast, arid conditions were less prevalent across the world and temperate climates were more common.

Marine biota

Sea levels in the Devonian were generally high. Marine faunas continued to be dominated by bryozoa, diverse and abundant brachiopods, the enigmatic hederelloids, and corals. Lily-like crinoids were abundant, and trilobites were still fairly common, but less diverse than in earlier periods due to the abundance of mobile swimming predators such as early sharks and predatory bony fish (Osteichthyes) such as Dunkleosteus. The ostracoderms were joined in the mid-Devonian by the first jawed fishes and were declining in diversity and were being out competed by the jawed fish in both the sea and fresh water, also the great armored placoderms, as well as the first sharks and ray-finned fish. The first abundant species of shark, the Cladoselache, appeared in the oceans during the Devonian period. They became abundant and diverse. In the late Devonian the lobe-finned fish appeared, giving rise to the first tetrapods.

The first Ammonites also appeared during or slightly before the early devonian period around 400 million years ago. A recently discovered fossil of a fish embryo attached to its mother by an umbilical cord in 380 million year old Devonian strata provides the earliest fossil evidence of vertebrates giving live birth to their young.

Reefs

A great barrier reef, now left high and dry in the Kimberley Basin of northwest Australia, once extended a thousand kilometers, fringing a Devonian continent. Reefs in general are built by various carbonate-secreting organisms that have the ability to erect wave-resistant frameworks close to sea level. The main contributors of the Devonian reefs were unlike modern reefs, which are constructed mainly by corals and calcareous algae. They were composed of calcareous algae and coral-like stromatoporoids, and tabulate and rugose corals, in that order of importance.

Terrestrial biota

By the Devonian Period, life was well underway in its colonization of the land. The moss forests and bacterial and algal mats of the Silurian were joined early in the period by primitive rooted plants that created the first stable soils and harbored arthropods like mites, scorpions and myriapods (although arthropods appeared on land much earlier than in the Early Devonian and the existence of fossils such as Climactichnites suggest that land arthropods may have appeared as early as the Cambrian period). Early Devonian plants did not have roots or leaves like the plants most common today, and many had no vascular tissue at all. They probably spread largely by vegetative growth, and did not grow much more than a few centimeters tall. Also the first possible fossils of insects appeared around 416 Ma in the Early Devonian.
By the Devonian, shrub-like forests of small, primitive plants existed: lycophytes, sphenophytes, ferns, and progymnosperms had evolved. Most of these plants had true roots and leaves, and many were quite tall. In the Late Devonian, the tree-like ancestral fern Archaeopteris and the giant cladoxylopsid trees grew with true wood. (See also: lignin.) These are the oldest known trees of the world's first forests. Prototaxites was the fruiting body of an enormous fungus that stood more than 8 meter tall. By the end of the Devonian, the first seed-forming plants had appeared. This rapid appearance of so many plant groups and growth forms has been called the "Devonian Explosion". Primitive arthropods co-evolved with this diversified terrestrial vegetation structure. The evolving co-dependence of insects and seed-plants that characterizes a recognizably modern world had its genesis in the Late Devonian. The development of soils and plant root systems probably led to changes in the speed and pattern of erosion and sediment deposition. The rapid evolution of a terrestrial ecosystem containing copious animals opened the way for the first vertebrates to seek out a terrestrial living. By the end of the Devonian, early amphibians and arthropods were solidly established on the land.

The earliest known trees, from the genus Wattieza, appeared in the Late Devonian around 380 Ma.

The 'greening' of the continents acted as a carbon dioxide sink, and atmospheric levels of this greenhouse gas may have dropped. This may have cooled the climate and led to a massive extinction event. See Late Devonian extinction.

 


Home | Decoration | Portraiture | Advertising | The Artist | Contact | Art Shop | Mural Painting Gallery | Tuscan Mural Painting | Venice Mural Painting |
Paris Street Scene Mural Painting
| Neoclassical Mural Painting | Mediterranean Mural Painting | Italian Restaurant Mediterranean Mural Painting |
Indian Restaurant Mural Painting | Landscape Mural Painting | Autumn Landscape Mural Painting | Trompe l'Oeil Ceiling Mural Painting |
Pyramid & Sphinx - Egyptian Trompe l'Oeil Mural Painting | Murale Peinture, Plafond, Meubles, Décoration : Montréal Québec | Renaissance Ceiling Mural Painting |
Cinema Ceiling Mural Airbrush Painting | Clouds and Birds Ceiling Painting | Dome and Pergola Clouds Ceiling Painting | Sky and Clouds Ceiling Mural Painting |
Aquarium Mural Painting | Swimming Pool Mural Painting | Swimming Pool Mural Painting - Trompe l'Oeil | Swimming Pool - Spa |
Salon des Ongles & Spa - Seascape Mural Painting | Spa - Exotic Seascape Mural Painting | Spa Waterfalls and Seascape Mural Painting |
Pool and Billiard Mural Painting | Hockey and Celebrity Mural Painting | Boys Rooms Murals Hand Painting | Kids Jungle Animals Nursery Murals |
Children Murals - Animal Painting
| Children Mural - Princesses | Four Seasons-Spring, Summer, Autumn, Winter-Mural Painting |
Scenic Backdrops Airbrush Painting
| Contemporary Murals | Graphic Arts and Calligraphy Mural Painting | Mural History Timeline | Mural Painting Process |
Painting Terms
| Mural Painting Quotation | Wall & Column Marbling | Hand Painted Furniture |
Oil Portraits | Charcoal Portrait | Watercolour Portrait | Framing | Figurative & Neo Classical Paintings |
Animal Paintings
| Dog Paintings | Cat Paintings | Bird Paintings | Botanical & Floral | Landscape & Seascape | Fish and Marine Painting | Dragon Designs |
Signage & Signboards | Fish and Meat - Hand Painted Signs | Sign and Canopy - Graphic Design | Multimedia | Animation | Web Design | Illustrations |
Balcony Border Faux Finish and Trompe L'oeil | Stair Faux Finish & Painting Decoration | Faux Finish Craquelure | Painting Walls, Murals and Ceiling |
Wall Painting, Floor Sanding & Varnishing
| The Art of Faux Finish | Fish and Meat Painting - Hand Painted Signs, Montreal |
Column Painting - Marbling Faux Finish & Trompe L'oeil Paintings
| Bathroom Mural Flower Painting


All Rights Reserved. Artist works, scans protected by Copyright ©2007
Atelier Ancheta, Montreal Quebec

www.RichardAncheta.com