Check the listing for details. Ice Age Horse Tibia. Condition: New. Listed at 75.00 USD. Ice Age Horse Tibia Age - 25,000 - 18,000 Years Old Pleistocene Epoch Species - Equus Specimen - Tibia Discovered - Orange County, Florida Measures Roughly 9" Long ** The Ice Age ** An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages and greenhouse periods, during which there are no glaciers on the planet. Earth is currently in the Quaternary glaciation. Individual pulses of cold climate within an ice age are termed glacial periods (or, alternatively, glacials, glaciations, glacial stages, stadials, stades, or colloquially, ice ages), and intermittent warm periods within an ice age are called interglacials or interstadials.