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The same observer considers Boghead coal, kerosene shale and similar substances used for the production of mineral oils to be mainly alteration products of gelatinous fresh water algae, which by a nearly complete elimination of oxygen have been changed to substances approximating in composition to C2H3 and C3H5, where C : H = 7.98 and C : O + N = 46.3.

Knowledge, 4-134: That, according to M. Daubrée, the substance that had fallen in the Argentine Republic, "resembled certain kinds of lignite and boghead coal."

In the beginning of 1850, Mr. Bartholomew, of the City and Suburban Gas Works, Glasgow, showed Mr. Young some specimens of the Boghead coal, with which he renewed his experiments, distilling the mineral at a low temperature, until he evolved a considerable quantity of crude paraffin.

Boghead coal, also known as "Torebanehill mineral," gives Boghead naphtha, while the crude naphtha obtained from shales is often quoted as shale-oil.