NOVELTY - Extracting (P1) hydrocarbon compounds, involves: retorting comminuted first feedstock infused with hydrocarbon compounds in first rotary retort kiln (102), to vaporize hydrocarbon compounds and latter being converted to inorganic hot waste rock char (106); extracting vaporized compounds and condensing; transferring hot waste rock char to second rotary retort kiln (107), where it is used to preheat second feedstock containing organic materials; retorting second feedstock by applying additional heat to second kiln to gasify organic materials and extracting materials and then condensing.    USE - As thermally-conjoined process for extracting hydrocarbon compounds from two disparate feedstocks processed separately such as for extracting hydrocarbon compounds from oil shale and converting municipal solid waste into recoverable carbonaceous gases and carbon waste fines (claimed) useful as transportation grade fuels.    ADVANTAGE - The process provides new options and alternative for jointly processing large volumes of largely-untapped, disparate energy resources into transportation grade fuels; has potential to reduce reliance on landfills for the storing of municipal solid wastes, which can constitute a health and/or environmental hazard for generations, or even millennia; converts municipal solid waste (MSW) into useful hydrocarbon fuels; and subsidizes transport of MSW feedstocks to a central processing location, thus as transportation and disposal of MSWs are prepaid by municipal residents and businesses, the transportation of such wastes to a processing site located at an oil shale processing site can actually be less expensive than burying it in a landfill, such a scenario can bode well for capital investment in such processes. The process converts energy by employing heat energy generated in one process for a subsequent and conjoined second process. The process allows for physically separate and precisely-controlled temperature settings and processing times to be tailored to a particular thermal processing method without incineration of the alternative energy feedstock to achieve optimum products in the energy extraction process. By combining the processing of MSW, which has relatively high thermal content with the processing of a more dense resource, such as oil shale, which has relatively low thermal content, can double, or even triple total recoverable BTU output yields at lower averaged costs. The process can provide an inexpensive source of construction-grade cementitious raw materials on a large scale for US infrastructure reconstruction. Thus the process can potentially create a strategic repository of construction-grade cementitious material that can, either be returned to the mining operation as finished goods inventory, treated as backfill or stockpiled at separate secure locations. The process can potentially provide an inexpensive source of raw materials on a large scale for coking carbons for steel making and other useful purposes.    DETAILED DESCRIPTION - Thermally-conjoined process (100) (P1) for extracting hydrocarbon compounds from two disparate feedstocks processed separately, involves: retorting a comminuted first feedstock comprising sedimentary rock, infused with hydrocarbon compounds, in a first rotary retort kiln (102), thereby vaporizing the hydrocarbon compounds from the sedimentary rock, the latter being converted to inorganic hot waste rock char (106); extracting the vaporized hydrocarbon compounds from the first rotary retort kiln; condensing the extracted vaporized hydrocarbon compounds for subsequent processing; transferring at least a portion of the hot waste rock char to a second rotary retort kiln (107), where it is used to preheat a second feedstock containing organic materials; retorting the second feedstock by applying additional heat to the second rotary retort kiln in order to gasify the organic materials; extracting the gasified organic materials from the second rotary retort kiln; and condensing the extracted gasified organic materials for subsequent processing. An INDEPENDENT CLAIM is included for a thermally-conjoined process (P2) for extracting hydrocarbon compounds from oil shale and converting municipal solid waste into recoverable carbonaceous gases and carbon waste fines, involving: retorting a comminuted oil shale feedstock (101) in a first rotary retort kiln, thereby vaporizing the hydrocarbon compounds contained in the oil shale and converting a remaining inorganic portion into hot waste rock char; extracting the vaporized hydrocarbon compounds from the first rotary retort kiln; condensing the extracted vaporized hydrocarbon compounds for subsequent processing; transferring at least a portion of the hot waste rock char to a second rotary retort kiln, where it is used to preheat a municipal solid waste (MSW) feedstock containing organic materials; retorting the MSW feedstock by applying additional heat to the second rotary retort kiln in order to gasify the organic materials; extracting the gasified organic materials from the second rotary retort kiln; and condensing the extracted gasified organic materials for subsequent processing.    DESCRIPTION OF DRAWING(S) - The figure shows a flow diagram of the thermally-conjoined process for extracting hydrocarbon compounds from two disparate feedstocks processed separately.    Thermally-conjoined process (100)    Oil shale feedstock (101)    First rotary retort kiln (102)    Inorganic hot waste rock char (106)    Second rotary retort kiln (107)    Heat recovery and exchange system (113)