Hestmark, Geir (2018). «Jens Esmark's mountain glacier traverse 1823 − the key to his discovery of Ice Ages». Boreas. 1 (på engelsk). 47: 1–10. ISSN1502-3885. doi:10.1111/bor.12260. Besøkt 28. februar 2021. «The discovery of Ice Ages is one of the most revolutionary advances made in the Earth sciences. In 1824 Danish‐Norwegian geoscientist Jens Esmark published a paper stating that there was indisputable evidence that Norway and other parts of Europe had previously been covered by enormous glaciers carving out valleys and fjords, in a cold climate caused by changes in the eccentricity of Earth's orbit. Esmark and his travel companion Otto Tank arrived at this insight by analogous reasoning: enigmatic landscape features they observed close to sea level along the Norwegian coast strongly resembled features they observed in the front of a retreating glacier during a mountain traverse in the summer of 1823.»
klassekampen.no
arkiv.klassekampen.no
Hverven, Tom Egil. «Isens spor». Klassekampen. Besøkt 28. februar 2021.
Hestmark, Geir (2018). «Jens Esmark's mountain glacier traverse 1823 − the key to his discovery of Ice Ages». Boreas. 1 (på engelsk). 47: 1–10. ISSN1502-3885. doi:10.1111/bor.12260. Besøkt 28. februar 2021. «The discovery of Ice Ages is one of the most revolutionary advances made in the Earth sciences. In 1824 Danish‐Norwegian geoscientist Jens Esmark published a paper stating that there was indisputable evidence that Norway and other parts of Europe had previously been covered by enormous glaciers carving out valleys and fjords, in a cold climate caused by changes in the eccentricity of Earth's orbit. Esmark and his travel companion Otto Tank arrived at this insight by analogous reasoning: enigmatic landscape features they observed close to sea level along the Norwegian coast strongly resembled features they observed in the front of a retreating glacier during a mountain traverse in the summer of 1823.»
worldcat.org
Hestmark, Geir (2018). «Jens Esmark's mountain glacier traverse 1823 − the key to his discovery of Ice Ages». Boreas. 1 (på engelsk). 47: 1–10. ISSN1502-3885. doi:10.1111/bor.12260. Besøkt 28. februar 2021. «The discovery of Ice Ages is one of the most revolutionary advances made in the Earth sciences. In 1824 Danish‐Norwegian geoscientist Jens Esmark published a paper stating that there was indisputable evidence that Norway and other parts of Europe had previously been covered by enormous glaciers carving out valleys and fjords, in a cold climate caused by changes in the eccentricity of Earth's orbit. Esmark and his travel companion Otto Tank arrived at this insight by analogous reasoning: enigmatic landscape features they observed close to sea level along the Norwegian coast strongly resembled features they observed in the front of a retreating glacier during a mountain traverse in the summer of 1823.»
