THE AGE OF REPTILES.
Antiquity, Duration and Significance in Geologic
Palæontology deals with
the History of Life. Its time is measured in geologic epochs and periods, in
millions of years instead of centuries. Man, by this measure, is but a creature
of yesterday—his "forty centuries of civilization"but a passing episode. It
is by no means easy for us to adjust our perspective to the immensely long
spaces of time involved in geological evolution. We are apt to think of all
these extinct animals merely as prehistoric—to imagine them all living at the
same time and contending with our cave-dwelling ancestors for the mastery of the
In order to understand the place of the Dinosaurs in world-history,
we must first get some idea of the length of geologic periods and the immense
space of time separating one extinct fauna from another.
The Age of
Man. Prehistoric time, as it is commonly understood, is the time when
barbaric and savage tribes of men inhabited the world but before civilization
began, and earlier than the written records on which history is based. This
corresponds roughly to the Pleistocene epoch of geology; it is included along
with the much shorter time during which civilization has existed, in the latest
and shortest of the geological periods, the Quaternary. It was the age of the
mammoth and the mastodon, the megatherium and Irish deer and of other quadrupeds
large and small which are now extinct; but most of its animals were the same
species as now exist. It was marked by the great episode of the Ice Age, when
considerable parts of the earth's surface were buried under immense
accumulations of ice, remnants of which are still with us in the icy covering of
Greenland and Antarctica.
The Age of Mammals. Before this period
was a very much longer one—at least thirty times as long—during which modern
quadrupeds were slowly evolving from small and primitive ancestors into their
present variety of form and size. This is the Tertiary Period or Age of Mammals.
Through this long period we can trace step by step the successive stages through
which the ancestors of horses, camels, elephants, rhinoceroses, etc., were
gradually converted into their present form in adaptation to their various
habits and environment. And with them were slowly evolved various kinds of
quadrupeds whose descendants do not now exist, the Titanotheres, Elotheres,
Oreodonts, etc., extinct races which have not survived to our time. Man, as
such, had not yet come into existence, nor are we able to trace any direct and
complete line of ancestry among the fossil species known to us; but his
collateral ancestors were represented by the fossil species of monkeys and
lemurs of the Tertiary period.
Fig. 1.—The Later Ages of Geologic
The Age of Reptiles. Preceding the Age of Mammals lies a long
vista of geologic periods of which the later ones are marked by the dominance of
Reptiles, and are grouped together as the Age of Reptiles or Mesozoic Era. This
was the reign of the Dinosaurs, and in it we are introduced to a world of life
so different from that of today that we might well imagine ourselves upon
None of the ordinary quadrupeds with which we are familiar
then existed, nor any related to nor resembling them. But in their place were
reptiles large and small, carnivorous and herbivorous, walking, swimming and
Crocodiles, Turtles and Sea Reptiles. The Crocodiles
and Turtles of the swamps were not so very different from their modern
descendants; there were also sea-crocodiles, sea-turtles, huge marine lizards
(Mosasaurs) with flippers instead of feet; and another group of great marine
reptiles (Plesiosaurs) somewhat like sea-turtles but with long neck and toothed
jaws and without any carapace. These various kinds of sea-reptiles took the
place of the great sea mammals of modern times (which were evolved during the
Age of Mammals); of whales and dolphins, seals and walruses, and manatees.
Pterodactyls. The flying Reptiles or Pterosaurians, partly took the place of
birds, and most of them were of small size. Strange bat-winged creatures, the
wing membrane stretched on the enormously elongated fourth finger, they are of
all extinct reptiles the least understood, the most difficult to reconstruct and
visualize as they were in life.
Dinosaurs. The land reptiles were
chiefly Dinosaurs, a group which flourished throughout the Age of Reptiles and
became extinct at its close. "Dinosaur" is a general term which covers as wide a
variety in size and appearance as "Quadruped" among modern animals. And the
Dinosaurs in the Age of Reptiles occupied about the same place in nature as the
larger quadrupeds do today. They have been called the Giant Reptiles, for those
we know most about were gigantic in size, but there were also numerous smaller
kinds, the smallest no larger than a cat. All of them had short, compact bodies,
long tails, and long legs for a reptile, and instead of crawling, they walked or
ran, sometimes upon all fours, more generally upon the hind limbs, like
ostriches, the long tail balancing the weight of the body. Some modern lizards
run this way on occasion, especially if they are in a hurry. But the bodies of
lizards are too long and their limbs too small and slender for this to be the
usual mode of progress, as it seems to have been among the Dinosaurs.
|ANIMALS OF THE AGE OF REPTILES.
||DINOSAURS corresponding to the
larger quadrupeds or land mammals of today.
CROCODILES, LIZARDS AND TURTLES still surviving.
corresponding to whales, dolphins, seals, etc., or
sea-mammals of today.
||FLYING REPTILES OR PTEROSAURS.
||BIRDS WITH TEETH (scarce and little
||PRIMITIVE MAMMALS of minute size
(scarce and little known).
||FISHES and INVERTEBRATES many of
them of extinct races, all more or less different from modern kinds.
Fishes, large and small, were common in the seas and rivers of
the Age of Reptiles but all of them were more or less different from modern
kinds, and many belonged to ancient races now rare or extinct.
animals or Invertebrates were also different from those of today, although some
would not be very noticeably so at first glance. Among molluscs, the Ammonites,
related to the modern Pearly Nautilus, are an example of a race very numerous
and varied during all the periods of the Reptilian Era, but disappearing at its
close, leaving only a few collateral descendants in the squids, cuttlefish and
nautili of the modern seas. The Brachiopods were another group of molluscs, or
rather molluscoids for they were not true molluscs, less abundant even then than
in previous ages and now surviving only in a few rare and little known types
such as the lamp-shell (Terebratulina).
Insects. The Insect
life of the earlier part of the Age of Reptiles was notable for the absence of
all the higher groups and orders, especially those adapted to feed on flowers.
There were no butterflies or moths, no bees or wasps or ants although there were
plenty of dragonflies, cockroaches, bugs and beetles. But in the latter part of
this era, all these higher orders appeared along with the flowering plants and
Plants. The vegetation in the early part of the era was very
different both from the gloomy forests of the more ancient Coal Era and from
that which prevails today. Cycads, ferns and fern-like plants, coniferous rees,
especially related to the modern
Araucaria or Norfolk Island Pine, Ginkgos still surviving in China, and
huge equisetae or horsetail rushes, still surviving in South American swamps and
with dwarfed relatives throughout the world, were the dominant plant types of
that era. The flowering plants and deciduous trees had not appeared. But in the
latter half of the era these appeared in ever increasing multitudes, displacing
the lower types and relegating them to a subordinate position. Unlike the more
rapidly changing higher animals these ancient Mesozoic groups of plants have not
wholly disappeared, but still survive, mostly in tropical and southern regions
or as a scanty remnant in contrast with their once varied and dominant role.
There is every reason to believe that upon the appearance of these higher plants
whose flower and fruit afforded a more concentrated and nourishing food,
depended largely the evolution of the higher animal life both vertebrate and
insect, of the Cenozoic or modern era.