Hierapolis is ſeated over-againſt Laodicea, where are to be ſeen baths of hot waters, and the Plutonium. [...] The Plutonium is under the brow of the hill, the entrance into which is no wider than that a man can thruſt himſelf through; yet it is very deep within, of a quadrangular form, containing about the compaſs of half an acre, and is filled with ſuch a thick and caliginous air, that the ground cannot be ſeen.
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By the time breakfast was announced, the land had faded into a thin caliginous streak; and, except passing a huge unwieldy Chinese junk, which lay at anchor, though her lateen sails were hoisted, nothing worthy of note occurred during the day.
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Inside the atmosphere was rank and caliginous: fumes rose from puddles, groans sifted through the shadows.
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They say the darkest hour is just before the dawn, and caliginous thoughts often swirled through his murky, insomniac mind as he lay awake [...]
Source: wiktionary