The phrase "ancient period" is correct and usable in written English.
It can be used to refer to a specific time frame in history characterized by ancient civilizations or cultures.
Example: "The ancient period saw the rise of great empires such as Rome and Greece."
Alternatives: "ancient era" or "antiquity."
In the most ancient period there were pit graves, sometimes in large stone tumuli.
Inscriptions from the latter part of the Ancient period show North Germanic as a distinct dialect.
This is a plan of Leptis Magna as it would have looked in the ancient period.
By the late ancient period, Iran itself was imagined as a garden, where all of its good people lived.
The volume of the earth had been fixed to a surprising degree of accuracy in the ancient period.
During this ancient period, sometimes called the Eemian, the oceans were about as warm as they are today.
The archaeologists discovered some structures related to more ancient periods: the Roman domus (1st 5th centuries) and the older cathedral with its foundations and crypt (10th century).
In fact, previous modeling studies indicate that ancient periods of ice melt may have caused the West African climate to become drier.
The snag is that today's climate models, when fed conditions resembling ancient periods, do not produce nearly enough warming to match the levels implied by the fossil record.
Thus many technicalities of landholding in the Nile Delta during certain ancient periods survive, unwarranted by any normal expectancies of epigraphic preservation elsewhere; only the happenstance of the Creto-Mycenaean records (see below Crete and Mycenaean Greece) has accidentally transmitted something analogous.
A new section in the annual report puts the ongoing warming in a broader context and finds it extraordinary when compared with data from "paleo" records, which seek to determine what the Arctic's temperature was like in ancient periods long predating modern thermometer observations.
