Flash pyrolysis is a thermal technique used to break down larger macromolecules into simpler monomers. This technique helps reconstruct the chemical composition of complex substances that are often difficult to analyze by conventional spectroscopic and chromatographic techniques such as gas chromatography and gas chromatography-mass spectrometry. Based on the microscope observations and because of the limited sample size available, we proceeded to geochemically screen the sample without any other preparative extraction by on-line flash pyrolysis gas chromatography mass spectrometry (Py-GCMS).