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Medial moraine
Moraine is the material (usually soil and rock) transported by a glacier and then deposited.
One of the moraine types created by deposited material is medial moraine. It is formed when two glaciers merge, and their edges meet form in consequence a line across the center of the new, bigger glacier. The line is formed of material from two lateral moraines of merging glaciers.
Medial moraines form only in the ablation zone of a glacier, which is why they are good indicators of where the line between the accumulation zone and the ablation zone is situated.
When glacier ice is melting, a ridge of material along the valley centre is left behind.
Jerome Wyckoff, https://www.britannica.com/science/medial-moraine
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