A geologic era that is marked by the culmination of all classes of invertebrates except insects and the appearance of seed-bearing plants, amphibians and reptiles. The Paleozoic era is divided into seven periods designated by inundations of seas. The Mississippian and Pennsylvanian periods of Kentucky occurred during the Paleozoic era.

one of four major divisions (eras) of geologic time. The Paleozoic is the second era of geologic time that lasted from 570 million till about 225 million years before the present.

The oldest era of the Phanerozoic Eon.

Paleozoic - An era of geologic time, from the end of the Precambrian to the beginning of the Mesozoic, about 570 to about 225 million years ago.

A time period in the earth's geologic history. This period began from approx. 600 m.y.a to approx. 225 m.y.a. (See : GEOLOGIC TIME)

The geological era between the end of the Precambrian (600 million years ago) to the beginning of the Mesozoic (225 million years ago).

the geologic period extending from 570 to 225 million years before the present

The era ranging from 600 to 230 million years ago also referred to as the Ancient Life Era. It is the first of the three major divisions of the geological time-scale after the Pre-Cambrian.

An era of geologic time, from the end of the Precambrian to the beginning of the Mesozoic, or from about 543 to about 248 million years ago.

That time span from the Cambrian to the Devonian when marine life became abundant (580 to 360 million years ago.)

The era containing the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian periods. It is usually divided into upper and lower with three periods in each division.

The second of the four Geologic Eras in which geologic time is divided. It extends from the end of the Precambrian Era (about 570 million years ago) to the beginning of the Mesozoic Era (about 230 million years ago). The Paleozoic Era is subdivided into the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian periods.

The geologic era from 570-225 million years ago. View timeline of geologic events.

from 544 million to about 230 million years ago

the second of four eras of the geologic time scale.

An era of geologic time, from the end of the Precambrian to the beginning of the Mesozoic, spanning the time between 544 and 248 million years ago. The word Paleozoic is from Greek and means "old life."

Pertaining to or existing in the Paleozoic era, from 570 to 240 million years ago.

(see Geological Timescale)

the oldest of three eras of the Phanerozoic Eon. The Paleozoic Era spans the time from 540 Ma to 225 Ma.

Period of Earth's history from 670 to 245 million years ago.

The earliest of three eras of the Phanerozoic eon, lasting from 570 to 245 Ma. It is preceded by the Precambrian interval and followed by the Mesozoic era, and consists of the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian periods.

An era of geological history which extends from the beginning of the Cambrian to the close of the Permian and is marked by the culmination of nearly all classes of invertebrates except the insects and in the later epochs of which seed-bearing plants, amphibians, and reptiles first appeared.

The era ranging in time from 600 to 230 million years ago, a duration of 370 million years. The Palaeozoic was preceded by the Precambrian and followed by the Mesozoic

(Primary) geologic era ranging from 540 Ma to 245 Ma.

A major interval of geologic time that began about 540 million years ago with an extraordinary diversification of marine animals and ended about 245 million years ago with the greatest extinction event in Earth history.

The era of geologic time from 570 to 225 million years ago, from the end of the Precambrian to the beginning of the Mesozoic.

An era of geologic time lasting from 543 to 248 million years ago. Derived from the Greek palai "long ago, far back" + zoe "life".

A geological term denoting the time in Earth history between 570 and 245 million years ago.

Geologic era that occurred from 570 to 245 million years ago.

A period of time stretching from 545 to 258 million years ago, encompassed the Ordovician, Silurian, Devonian and Carboniferous periods.

the era after the Proerozoic and before the Mesozoic, characterized by the development of the first fishes, land plants, amphibians, reptiles, insects, and forests of fernlike trees; the rocks formed in this era. [AHDOS

The Paleozoic Era (from the Greek palaio, "old" and zoion, "animals", meaning "ancient life") is the earliest of three geologic eras of the Phanerozoic eon. The Paleozoic spanned from roughly 542 MYA to roughly 251 MYA (ICS, 2004), and is subdivided into six geologic periods; from oldest to youngest they are: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian.