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A sidewall coring tool includes a tool housing, a coring assembly coupled and a marking device. The defines a longitudinal axis and is adapted for suspension within the borehole at a selected depth. The coring assembly is coupled to the tool housing and includes a bit housing and a coring bit couple

A sidewall coring tool includes a tool housing, a coring assembly coupled and a marking device. The defines a longitudinal axis and is adapted for suspension within the borehole at a selected depth. The coring assembly is coupled to the tool housing and includes a bit housing and a coring bit coupled to the bit housing. The coring bit is supported for movement between a transport position and a coring position. The marking device is located at a known position with respect to the coring bit and is adapted to form an orientation mark in the formation.

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What is claimed: 1. A sidewall coring tool for use in a borehole formed in a subterranean formation, comprising: a tool housing adapted for suspension within the borehole at a selected depth and defining a longitudinal axis; a coring assembly coupled to the tool housing, the coring assembly includi

What is claimed: 1. A sidewall coring tool for use in a borehole formed in a subterranean formation, comprising: a tool housing adapted for suspension within the borehole at a selected depth and defining a longitudinal axis; a coring assembly coupled to the tool housing, the coring assembly including a bit housing and a coring bit coupled to the bit housing, the coring bit being supported for movement between a transport position and a coring position; and a marking device located at a known position with respect to the coring bit and adapted to form an orientation mark in the formation, wherein the marking device comprises a cutting blade. 2. The sidewall coring tool of claim 1, in which the coring bit defines a coring bit axis, and in which the coring bit axis is substantially parallel to a borehole axis in the transport position and substantially perpendicular to the borehole axis in the coring position. 3. The sidewall coring tool of claim 2, in which the coring assembly includes a motor operably coupled to the coring bit, and in which the marking device is operably coupled to the coring motor to reciprocate the marking device. 4. The sidewall coring tool of claim 3, in which the marking device is offset with respect to an axis of the coring bit. 5. The sidewall coring tool of claim 1, in which the marking device is coupled to the tool housing. 6. The sidewall coring tool of claim 1, in which the coring bit is operable at an oblique angle, and in which the marking device comprises a cutting end of the coring bit when operated at the oblique angle. 7. A sidewall coring tool for use in a borehole formed in a subterranean formation, comprising: a tool housing adapted for suspension within the borehole at a selected depth and defining a longitudinal axis; a coring assembly coupled to the tool housing, the coring assembly including a bit housing, a motor, and a coring bit disposed in the bit housing and operably coupled to the motor to move between transport and coring positions; and a marking device supported for reciprocating movement with respect to the tool housing and operably coupled to the coring assembly motor, wherein the marking device is offset with respect to an axis of the coring bit. 8. The sidewall coring tool of claim 7, in which the marking device comprises a cutting blade. 9. The sidewall coring tool of claim 7, in which the coring bit defines a coring bit axis, and in which the coring bit axis is substantially parallel to a borehole axis in the transport position and substantially perpendicular to the borehole axis in the coring position. 10. A sidewall coring tool for use in a borehole formed in a subterranean formation, comprising: a tool housing adapted for suspension within the borehole at a selected depth and defining a longitudinal tool axis; a coring aperture formed in the tool housing; a core receptacle disposed in the tool housing; a bit housing disposed within the tool housing; a coring bit mounted within the bit housing, the coring bit including a cutting end and defining a coring bit axis; a bit motor operably coupled to the coring bit and adapted to rotate the coring bit around the bit axis; a rotation actuator operably coupled to the bit housing and adapted to actuate the bit housing between an eject position, in which the coring bit axis is substantially parallel to the tool axis, and a coring position, in which the coring bit axis is substantially perpendicular to the tool axis; an extension actuator operably coupled to the coring bit and adapted to move the coring bit between retracted and extended positions, wherein the extension actuator is operable independent of the rotation actuator to extend the coring bit when the coring bit axis is at an oblique angle, thereby to form an orientation mark in the formation. 11. A method of marking a core retrieved from a sidewall of a wellbore penetrating a subterranean formation, comprising: suspending a sidewall coring tool within a borehole at a selected depth; marking a surface of the borehole at a selected location with a marking device to form an orientation mark; and extending a coring bit into the formation at the selected location to form a sidewall core, wherein the marking device is offset with respect to an axis of the coring bit. 12. The method of claim 11, in which the marking device comprises a cutting blade operably coupled to the sidewall coring tool. 13. The method of claim 12, in which the coring bit is operably coupled to a bit drive for rotation between a transport position and a coring position, and in which the cutting blade is also operably coupled to the bit drive. 14. The method of claim 11, in which the coring bit includes a cutting end, and in which the marking device comprises the coring bit cutting end. 15. The method of claim 14, in which the coring bit is operated at an oblique angle and extended only partially into the formation to form the orientation mark.