Tag Archives: glaciers

THEMIS: Mamers Valles

Posted on June 19, 2014 by rburnham

THEMIS Image of the Day, June 19, 2014. The channels in this VIS image are part of a complex valley system called Mamers Valles. Mamers Valles is located on the northern margin of Arabia Terra. More THEMIS Images of the … Continue reading →

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Debris aprons and valley fill hold ancient ice several hundred million years old

Posted on November 14, 2013 by rburnham

Along the edge of the crustal dichotomy, where the southern highlands step down onto the northern plains, lies a landscape of mesas, buttes, and valleys. Valleys appear choked with linear streams of debris, and on the flanks of many mesas … Continue reading →

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Latitude controlled Amazonian ice flows

Posted on May 18, 2012 by rburnham

Signs of underground ice deposited in the Amazonian period (the most recent in Martian history) are common in many places on Mars. Evidence includes tropical mountain glacier deposits, lobate debris aprons, lineated valley fill, concentric crater fill, and pedestal craters. … Continue reading →

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Southern polar eskers point to warmer past

Posted on March 16, 2012 by rburnham

Ice caps and glaciers on Mars today are “cold based,” meaning they are frozen solid to the ground beneath them. Scientists think the ice has been this way for most of the Amazonian period, the latest chapter in Mars’ geological … Continue reading →

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Dry ice glaciers?

Posted on October 12, 2011 by rburnham

Scientists examining rocky remnants in Mars’ northern polar region believe they have found evidence for a type of glacier unknown on Earth – one where the ice is made of frozen carbon dioxide rather than water. Mikhail Kreslavsky (University of … Continue reading →

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A polar ocean leaves few clay deposits

Posted on August 28, 2011 by rburnham

The northern lowlands of Mars have long invited the notion that in ancient times they once contained a now-vanished polar ocean. Yet a longstanding argument against such was the lack of widespread clay minerals that would naturally occur with such … Continue reading →

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