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Source-to-sink interpretations of genetic equivalency between fluvial feeder systems and basin accumulations infer that the sediment and water mass collected and transferred by rivers from the catchment is in balance with the mass ultimately delivered to the depositional basin. This relationship has value for modeling basin-fill volumes, climate and climate change, ocean water mass, and other applications. Executing an estimate of this mass balance is challenging in modern systems but even more difficult in deep-time stratigraphic systems where the catchment is no longer active and critical variables from the source and sink system are either not preserved or preserved with large uncertainties. Available data sets from stratigraphic systems are likewise often limited to a few localized boreholes, scattered outcrop, and/or geophysical surveys. This paper offers a method, the fulcrum test, for estimating …